The biggest advantage to the 18" wheels is tire choice (plus cheaper tire options). I'm still waiting for my 18" Forgestars to come in ... some day. I have some 18" Nitto NT01 tires waiting to go on first, after that I will probably switch to Kumho V710's (it's easier to build corner confidence by increasing grip gradually).
The 19" tires that are available are limited. Many perform well, but all are $300 a tire.
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