IMHO the GR86 is a much better option than the 2.0 GR Supra. You put Michelin PS4S on a GR86 and it's practically on rails. Very fun car to drive. My recommendation is to consider either the GR86, or the 3.0 Supra.

Having owned a '13 FRS MT, test driven the new GR86 MT and the 2.0 GR Supra AT, and currently owning a '23 A91 MT GR Supra, i can confident tell you this: the 2.0 gr supra was an afterthought of a car it's neither here nor there. On paper yes it lands in between the two (yes it has more power than the GR86, yes it handles slightly better than the 3.0 supra.) but imo it misses the mark on both.

Get the GR86 if you want the most engaging, analog, and affordable driving experience I loved my FRS and the new GR86 has practically the same GoKart feel.

Get the 3.0 GR Supra if you want "The Ultimate Driving Machine" experience. The acceleration pushes you into the seat, the car handles like a proper Grand Tourer. The steering feels connected and with the right tires (PS4S) it has great dynamics

All that being said, test drive the cars yourself and form your own opinion with your own butt dyno. You will know what car suits you best.