Rent vs. buy. In finance circles, it's a bigger debate than "paper vs. plastic" or "tastes great vs. less filling."

It remains a debate fought by smart people on both sides, because the variables make calculus look like third-grade math.

Advocates of buying will use arguments that feature phrases such as "throwing away money on rent," "mortgage interest rate deduction," "locking in a monthly payment," and "forced savings." They may even appeal to your sense of community by pointing out the social benefits of an ownership mentality.

Advocates of renting will say the benefits of homeownership are overrated while the costs are underrated.

From the title of this column, you know where I stand. But let's give the rent advocates their due.

Rent vs. buy: The case against buying a house

A popular argument against owning housing is that home prices barely keep up with inflation. Using Yale Professor Robert Shiller's data that goes back to the late 1800s, we're talking about just 0.2% annually. Yes, that's a decimal point before the two. Compare that inflation-adjusted return with the 6%-7% historical real return of the stock market and you can see where their argument is headed.

Buyers also pay closing costs, real estate agent fees, homeowners insurance premiums, property taxes, and sometimes refinancing costs.

Then there are the "investments," which are often better classified as "cool stuff I want," or maintenance costs -- neither of which meaningfully increase the value of the house.

I've owned a house for 10 years, so let's use me for illustrative purposes. Here's a list of things I've bought that cost at least $1,000 (often much more). Renters normally don't directly pay for any of this stuff.

Hardwood flooring

Deductible on homeowners insurance after my washer flooded the basement

Landscaping (twice)

Laminate wood flooring

New roof

Painting and fixture upgrades (pre-wife)

New heating/cooling system

New sliding glass doors

Cutting down of diseased trees or trimming of healthy trees (three times)

Stainless-steel refrigerator

Blinds

Painting, bathroom refurbishing, and fixture upgrades (post-wife)

I fancy myself strategically frugal, but stuff breaks, neighbors complain about overgrown vegetation, and new wives refuse to live in a bachelor pad. So I've averaged more than one $1,000-plus item a year -- and I fully expect that trend to continue. Also remember that I'm excluding anything costing two or three digits -- like replacing the dishwasher (twice), the washer (twice), the dryer, the refrigerator (twice before the stainless-steel upgrade), the sump pump (whatever that is), the water heater, and a toilet. We haven't even talked about the countless Home Depot and Ikea nickel-and-dimes. And I've so far avoided the big kahunas of homeowner money pits -- additions and full-blown renovations. Others haven't.

Given all this, I'd agree it's fair to factor in a good deal of hidden ownership costs that go beyond sizing up your mortgage against a comparable rental.

Plus, there are the harder-to-quantify costs. The lack of liquidity (hence the term "house poor"). The massive debt you're taking on. The inherent risk and lack of diversification once you sink so much into one asset. Reduced mobility, making it harder to move to a new city or perhaps change jobs within the same city. The nights and weekends you spend on house projects. The ever-present responsibility and stress.

You get the idea. There are careers' worth of arguments, theories, and speculations on why homeownership is overrated. But when you step away from the rhetoric, there's one fact that trumps everything: Nothing has built wealth for the typical family in the United States like homeownership.

Rent vs. buy: The buyer's trump card

When the Federal Reserve tallied it up in 2010, the median household had $77,300 socked away in net worth. In other words, when you look at a family that's doing better than 50% of us and worse than 50% of us and you add up all their assets (stocks, bonds, house, cars, IRAs, 401(k)s, gold, equity in private businesses, checking accounts, savings accounts, certificates of deposit, cash under the mattress, etc.) and subtract out all their liabilities (mortgages, student loans, credit card debt, etc.), you end up $77,300 to the good.

How much of that is due to owning a house? Here's a picture:

It's pretty stunning that for all the hidden costs and arguments about better investments, housing makes up more than 60% ($47,500/$77,300) of the median family's cushion against bankruptcy.

Now you still may not be convinced. You may be clinging to the thought that those without homes should be able to put the money they don't spend on curtains and sump pumps to better investment use. It's a compelling theory refuted by reality. Here's the picture:

That's over a 30-to-1 net-worth advantage in favor of homeowners. Anticipating the sharp readers who will argue that this could be demographics (e.g., older people, more educated people, families, or high-income people are more likely to own houses), I looked further. Households headed by folks under age 35 have a median net worth that's about double the $5,100 median net worth of non-homeowners. Households headed by folks with no high school diploma have saved more than triple what the non-homeowner has. So have single folks with no children. And, yes, even families in the bottom 20% of income have more net worth than the non-homeowner.

Pretty darn stunning.

We can speculate on why this is. I subscribe to the simple, classic argument in favor of homeownership. Each month, homeowners are automatically squirreling away the principal portion of their mortgage payment -- as opposed to the renter, whose whole rent is an expense. People sometimes forget that the alternative to a mortgage is paying rent (not investing in the stock market) when they argue that home prices barely keep up with inflation.

As for the hidden costs of homeownership, I think a greater percentage of us than we'd like to admit end up blowing the money anyway -- on fancier vacations, or extra glasses of wine on nights out, or living in a more upscale house or neighborhood, or shoes, or playoff tickets, or whatever it is that keeps our median net worth at just $77,300.

Don't misunderstand me. This isn't a call to arms for everyone to jump willy-nilly into one of the biggest, most complicated financial decisions of their lives. The harrowing stories from the housing bubble showed us what happens when we buy when we don’t have enough income or savings, overpay, or don't do our due diligence. There are also non-financial reasons that buying a house just doesn't make sense for some people.

And nothing I've written should be interpreted as a justification to buy that expensive rug instead of putting a little extra into your 401(k).

This is just a reminder that there are many theories on the other side, but the real-world numbers greatly favor buying versus renting when all else is anywhere close to equal.