No way
15's look way better........on a
Miata of course
!
I ditto Bilbo Baggins answer, it depends if you think 15s, or 16s look good to you. If they don't look good enough to justify their performance gains, and the larger wheels grab you more, then go ahead and take them. Just that most people who go to large wheels such as 18s, and larger, tend to regret it. They may not want to admit it, but it's either the ride quality, or the HI$$$ that has to be dished out for rubber.
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Happy Motoring,
Kurt STS2 #5
My 1990 Classic Red Miata 
