The second spring arrives I will be getting some.

If the tire fits the wheel and the contact patch is bigger ultimate grip will be higher but with a huge wheel/tire it will feel lazy and your braking will suffer, now by suffer by the numbers the heavier wheel is harder to stop and start but how much in the real world I don't know and I don't think it much.

Wheel diameter has nothing to do with handling, wheel width and tire size do, so I don't agree that a bigger wheel will handle better. The correct tire on the correct wheel will improve handling but may come at the cost of feel.

I would not say you need bigger brakes for the bigger wheels, good pads maybe but if even then I would think most guys can still lock up their 20's with stock pads and unless your going to road or lap you will not need bigger brakes, that being said you will still out brake every jacked truck with 22's and mud tires with tiny stock brakes lol

Go with 20's and be happy knowing you will save fuel, have more and cheaper tire choices and can get a nice set of replica 20's for $799 all day long.