A 3/4 ton truck is great if you're going to use it as a truck with hauling or towing. Otherwise, all it translates to is higher fuel costs and repair costs. Remember, with a heavier truck you need load-rated tires, etc... Much more expensive. And you will go through tires much quicker with a heavy diesel truck. Fuel will be more expensive, too, because the mileage between the 1/2 ton gas vs 3/4 diesel will most likely be negligible. Other things like ride quality will suffer, too, with a heavier truck, though that may not be important to you.

If it's gonna be your daily driver/commuter I'd recommend the 1/2 ton gas.