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It's a matter of opinion. I had 20" Volk GT30s. They looked way too big and the tires too small, so I sold them. I moved down to 19s and couldn't be more pleased. Also, 20s are heavier and I'd rather not sacrifice performance if I don't have to.
20s look better IMO only problem is, if your roads aren't forgiving you'll damage them. If you're not tracking then peformance difference shouldn't matter.