I like 20s because I think that they look better. I suppose you would not like the 24s on my truck?
There are other advantages... they are more responsive to steering input due to lack of sidewall flex... they will also allow me to install 16" brakes.
Sure I want my car to handle good... but above all else, I want to achieve a certain look... and that my friend, includes large 20" wheels... regardless of the changes to handling, etc. I like my wheels to fill the wheel arch, and it's also important for me that the rim tucks... something that you can't do with small wheels.
I am not building a race car... performance is very important to me, but you do need to make some sacrifices... otherwise we would all be driving stripped out cars with no sound deadening, heat, or interior. I mean... the extra weight hurts performance right?
I am quite intelligent actually... that's how I earned the lifestyle that I have now.