With the option of a OE 14" car going up to a 15", would you do it and why?

For the record, its an ITA Miata.

What are the advantages/disadvantages of the increased wheel size at 15"? On paper it seems to me that the smaller diameter will be a lighter wheel & tire, and more specifically, will have a smaller moment of inertia. However, are there handling differences that get created by the different wheel size that would offset this rotating mass advantage?

While we're at it, 205 or 225 width?

Thanks
Matt