Very early MIM Strats may have cheap pots and switch, at some point Fender started using the same pickguards, switch and pots as USA. Some have alnico pickups, most have ceramic bar magnet pickups. They are ok, pretty hot, some like them some don't.
As posted 2006 up, med jumbo frets 9.5" fretboard radius, full size trem block (not steel).
Just play some and see what you like, that's the most important thing.
I like the 9.5" radius and med jumbo frets, but I played the vintage 7.25" radius necks with vintage frets for many years.
And some MIM Strats have 12" radius necks.
If you really shop around, you can often find a good used American Special Strat for not a lot more than the higher end MIM Strats, the Am Specials have a great neck (big peghead) 22 med jumbo frets, 9.5" radius, alnico pickups and a tremolo with a steel block.
I like mine a lot! And I've had many MIM Strats.