I like the 20 inch wheels look as far as the way they fill the wheel well and absolutely hate the 18's in that place.
I do not want any of that nonsense low rider rubbing stuff though. I don't want to worry about turning lock to lock or rubbing at really high speed so there's gonna have to be compromise somewhere besides ride height at high speed.
6 inches off the ground is really pushing the limit of actually being able to use an under body sheeting to create a venturii to add unsprung weight with out physical weight or added drag.
I don't like either style of wheels these are just for size and functionality checking.
I do like the width in the front with the 2 smaller tires side by side. I can easily narrow the frame to allow for that.