S2000 over 86 in many many ways, give it a few years the 86 will depreciate and will go for roughly the same value as a well maintained S2000.
Bear in mind we're talking cars from 2012-2014 vs 1999-2007.

Same shit is gonna happen to the 86 as it did to the FN2R - Appealed to the younger crowd who had a bit more cash to spend and wanted something newer.
After owning it for x years they realize its now super common and its depreciated as with anything but obviously being newer they are the ones who unfortunately cop the 5-10k depreciation. The amount of white 86s in Western Sydney is ridiculous .

Unless you ABSOLUTELY needed 4 seats or you have something for the aesthetics of the 86 - you'd be crazy to take the 86 over the S2000.