What size to get for +0 tire size for stock P5 rims?

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95 Miata, 14 CX5 Touring FWD, 18 CX9 GT FWD
I'm in the market for new dry+wet performance tires soon for my 2003 P5 with 16in rims. I wanna do a +0 upgrade, but dunno whether to go with 205/50/16 or 205/45/16.

I know there isn't much difference, just that the 45 series will be "1.7% too fast" and the 50 series will be "1.7% too slow"

I got stock suspension so I'm just wonderin which would be better.
 
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