Both cars are great, it all comes to down what you plan on doing with the car.
Money talks when it comes to horsepower, both cars have their pros and cons. I personally choice the FR-S because it was within my budget, insurance rate is great, its a really nice looking car, and I plan on adding to it.
Added bonus, FT86 Speedfactory is down the street from my house so aftermarket parts are easy to get it too, oh and the DISCOUNTS I get from them can't beat prices shipped to my door.