Having owned European cars and seen where European cars are heading, I believe Europeans care more about lap times and speed than "enjoyment fun." I know this is only my opinion and it doesnt stand for everyone but from what I have seen so far this is true. Take the M3 for example. Stock for stock new models are faster but heavier than the out going model. Even Porsche my previously claimed "halo German car" which still is, has resorted to more and more electronics and the 991 GT3 wont even come in manual transmission anymore...
Personally of the three I would chose the e30 M3. I would love to have one over the BRZ but I wouldn't want to track what I consider a piece of art and potentially ruining it. If I had two that would be a different story
In addition, I am sure if the FRS has the same brand and model tires as the GTI it will run much faster. I am sure the Primacy HP arent doing it any justice and god forbid it has the bridgestones instead.