Ok, sorry ive omitted stealth by accident. So with rathound armor you get 27 movement points? Any other armor recommendation or uniques? Let's say you don't kill a group, how do you escape? Pop a forcefield? With small amount of movement points, without sprint you can't really move much, you get 57mp with haste.
Depends a bit. In the beginning, when the laser pistol is weak, you use all you have at your disposal: bear traps to prep chokeholds around corners, taser, nets, the environment. Later you get Imprint, can stun with electrokinesis if you need it badly. The movement has always been plenty (and restealth grenades might also work, though, I never used them), sure, high AGI builds have much more and that gives you much better mobility, but you do have plenty of options if you realize a fight doesn't go well. I used the stealth to scout and know where enemies are and get close enough to have a good hit chance.
Also, laser pistol is not too loud, so often stealthing around, picking off individual enemies can prep a fight well in your favor as well. But yeah, if you think real big groups like lurker prison, you better prep a nice choke hold and lure people there.
In terms of armor: infused rat hound for crit.chance, not so much movement. I preferred the light tac vests as they look better, but if you want to max crit. chance, definitely this.
I think I also always had some stealth gear (black cloth armor, stealth generator) around, but can't remember ever needing it. For what it's worth, I played the Balor mission (which is a typical sneaky mission without any problems with the build).
Edited to add: energy shields also help. Picking off targets so that in the worst case people remain, who can't penetrate your shield.
Edited again to add: Force Field is also excellent to block damage, if people have to move around it first or it creates the chokehold you need for imprint or traps
Edited yet again: Grenades and flash bangs against big groups help too. If you have seven shots and expect to kill five, this does cover most groups, so if you come against a really big group, all of the above should be an option as you won't likely have run out of flash bangs etc.