i used deflection when playing on PHW, but it realized that even with 2x damage resistance, i died quickly
armor enhance does very little since you don't run around coverless in PHW with armor on
so i use Nano recharge, i can easily sneak past enemies and stealth kills with with silent weapons, and if you are under fire, you just wait 3 seconds and sneak out of there
on MP i use Nano transfer and Nano recharge, getting to Nano recharge II is a pain in the ass, you need ro regen your health back to full 500 times, i get like 8-16 , i think i played like 40-50 games before i got lvl 2, but after you have it, it's really really useful, if someone is firing to you and you have no energy, you can just walk behind an object and in 3 seconds you have your energy back to 50, and i always sneak and kill them
though i also use nanorecharge on maps that don't have much cover, or are small do i need to fight a lot of enemies and have to time to recover
but after the new update is rolled out which reduces energy transfer from 40/60/100 to 20/40/60, i'll switch to nano recharge permanently