For starters, laser and LCD are not competing technologies, so you can't really draw a comparison between them. You would be choosing between these types:

DLP with laser/solid state light source

DLP with UHP lamp

LCD with UHP lamp

You would first be choosing between LCD and DLP, and then if you want DLP you have a choice of light sources.

Laser projectors use lasers (or other solid state light sources) as the lamp. The main benefit is "lamp life" at a typical quoted 20,000 hours instead of the more common 3000-5000 hours quoted for UHP lamps.

If you have to spend 3x as much to get a laser/solid state model, the economy doesn't work out as you would be able to replace the bulb for a much lower cost.