The Miata is the "EASY" button. No doubt.
Lighter, better suspension, generally less rust, more aftermarket, blah, blah, blah
Would I trade my AW11? Cold day in hell.
Not that I dislike Miatas, I just loooove the MR2 (why don't you marry it?). In fact, you better love your AW11, because if you don't it'll simply rot away. For a long-term ownership, think about replacing every last piece of rubber on the car, or wait for it to sideline the car and hope that nothing else gets damaged in the process. At least when you eventually fix everything that's aging, it stays fixed. I guess the earliest Miatas aren't that far away from the same age either though.
Every time I drive it, I marvel at how different it feels compared to just about everything else. Between it's drivetrain layout, short wheelbase, and uber-80's styling it just pushes all my buttons at once. I know it's an emotional thing, and not a rational one, but I just can't say that about the Miata. Sometimes I wish I could though, as my life would probably be a lot easier.
Autocross - the AW11 is at a disadvantage in the stock and lightly modified classes (STS). I don't think it matters on a local level, but it'd be real tough at Nationals in those classes. They do pretty darn well in the more highly modified classes though when you can really start to move stuff around and deal with their shortcomings (strut suspension geometry, move weight to the front, remove weight period). Steve Hoelscher's (sp?) DP champ AW11 comes to mind. Honestly though, I could give a rat's ass. The car is still faster than me and is more fun than a bag of monkeys with a kitten thrown in for good measure.
Snap Oversteer issue on early cars - I call BS. I have an "early" 86 and the only time I've ever spun is doing dumb E36 M3 at an autocross. I've refreshed the suspension though with bushings, ball joints, tie rods, and of course springs/shocks. Just don't drive it like a FWD Honda and you'll be ok.
And just because I finally have a reason to post it, here's my noob-magneted ride.
BTW - Kinda surprised at the amount of vitriol in this thread. I had no idea the controversy was so fierce!