All very different cars, all with their own unique character.
Mazda are great at denial and even hoodwinked vosa over an issue on my wife's MX5, she still absolutely loves it although yesterday she did take a shine to a classic MG.
The 86 is very lithe. It has a 5 year warranty, the only issue I have had so far is the naff under specced battery gives the mog a good run in the going flat race.
The beaten up tatty smart is a fantastic tarmac hugger and 15 years on still enjoy driving the little 698cc turbo.
In terms of space the MX5 is the least capable with the 86 having the most room, you get surprised looks at the local tip on how much stuff you can get in it!
The little old smart roadster is like a tardis inside I am 6'3"
All different and all great fun.
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3)