Like everyone else has already said, lowering it isnt necessary and will affect the ride quality unless you do an over the top suspension kit. A lot does really on what brand tire you are going with what wheels you go with and of course smaller sidewall means Moree bumpy so stay 35 sidewall If...
This is a Nitro Yellow Supra that we did on a 20x9.5 and 20x11 Setup. Personally think 20s looks insanely good on the Supras but understand the want for 18s/19s.