Weight issues and forged vs. cast aside, the 18s handle just as well and have a better ride than the 19s. I've had both stock 18s and 19s on the car--both with PS2s.
It comes down to looks; I tired of the 18s, now have 19s.
I think it's pretty much a given from the track rats around here 18s are the best for that application.
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