Their defences apply logically to what the class has to deal with.

Apothecary(medical doctor) suit has higher husk res than the others

Sparky(electrical) has higher radiation res than the others

Cadet(security) has higher physical defence and bleeding res than the others

Apprentice(mechanical) has higher bite wounds res laceration res and blunt force trauma res than even cadet but cant handle bullets and bleeding as good. (slightly higher radiation res too but not as good as sparky) however fear the flame

Navigator(captain) and standard procedure(assistant) are more balanced and even in terms of resistances.

The fool suit is gaze piercing madness you fool why would you wear this you would need to be a mad fool in order to wear such a thing. but it does also offer uniquely stun resistances see the fool suit discussion thing if you want a bit more info on it.

Not giving actual numbers as it makes it fun to figure em out yourself. I'm just reminding you that these suits do have a logic to them and what class benefits the most from them.
Nor comparing them to vanilla. dunno about speed hard to guage cuz i dont have a timer. but they seem to be roughly the same speed.

Just remember resistances arent everything as each suit here also has it's own unique abilities and uses as seen in the pinned suit information tab(beware more spoilers). Meaning sometimes it may be worth it to use a suit outside your class i.e Apothecary being used by security as a backup medic to also takeout husks.