Hmmmm.
MIA, better electronics, fewer body pieces, upgraded hardware, cost a lot more.
MIM, more vintage style electronics and hardware, possibly more body sections (except my ashwood model), more affordable for every day working players plus a lot more room for modifications without hitting price of an MIA.
Just my humble opinion, been playing MIM and MIJ Strats my whole playing career, no major beefs what-so-ever.
Play a few find the one you like and buy it, then just have fun. No debates, no worries, no hassles.
Oh, by the way, this was not ment to sound mean or degrading in any way.