My $.02 worth.
Miata
Pro:
Large fields, greater possibility that there will be someone going your speed to race with.
??probably more cars available to buy verse build.
A sports car??
Con:
Older cars usually with more maintenance required.
The cars that run up front are really much faster than mid field. See GrassRoots Motorsports article on SM's
Yes, the are all dented up, close racing=bent metal.
Too small inside for real men. lol 6" 4" doesn't fit. (SF are for big guys, or other sized too)
Spec Focus
Pro's
Cars are made in this century.
Ford does support. This means several things that are not totally visible but benefit the competitors. (I got a nice check for 2nd at Nationals.)
Cars are Front wheel dirve like most of us drive now days.
Ford has worked hard to equalize the performance and will continue to review.
Pretty close racing so far.
Con:
Not many cars now. Growing. Makes for a small fraternaty. Mostly in Ohio, Michigan, Virginia, ? Another car is appreciated by the competitors and they are ready to help....(till you beat them)
More car around you when bad things happen.
So, what fits your needs, hope, desires, wishes, wants, dreams, budget, body size, ??