The amount of DERP in this thread is astounding with people talking about feelings and such... There is only one right question to ask. After 3 years, which choice results in me having more money in my pocket? Forget how leasing or buying "makes you feel", just grab a sheet of paper, a calculator, and take three minutes to do the damn math.
Depending on your mileage, finance rates, incentives, and lease residuals, the answer actually does vary. In my experience if you want a new car every three years, it is almost always financially better to purchase and resell the car (even if you just trade it in at the dealer)... However there ARE occasionally fantastic lease deals with unrealistically high residuals that make sense.