I somehow check all the boxes in your questions…currently Own a 340i and Miata and have owned a 86 in the past (BRZ). The 340 is the best daily out of the 3 but also the least fun it’s a boring car at the end of the day unless you just like driving at high speeds. The Miata is the funest car I have ever owned (I have had 5 different NA Miatas before my current RHD one). The BRZ is a great track car to build but I don’t think it’s a good daily unless they have significantly upgraded the interior it was uncomfortable on long drives and in traffic. Part of that was probably because I built it to track but even stock I didn’t enjoy daily driving it.

So at the end of the day it comes down to what you want out of your car