The PlayStation 4 is just three years old, but Sony already has an upgrade: the $400 PS4 Pro. Whether you’re thinking of finally getting a PlayStation, or just stepping up to the latest edition, paying the Pro premium depends on your TV set.

The PS4 Pro and the regular PS4, which sells for $300, play the exact same games and run the exact same video streaming apps. The difference is that the PS4 Pro has more RAM, a 31% faster CPU and more than double the graphics processing power.

While...