strongback - useless
bonus move - useless
bonus range damage - good if you take 2, along with kamikaze is super
lifegiver - not useful, too many stim around anyway, and if you know what to do, you rarely have to use it
bonur rate of fire - must
action boy - double is good
sniper - another must
I also take more critical and better critical, if you have 6+ luck, it's deadly
My last game which I finished 3 days ago, I had everyone in my squad take fast shot(from mutate) including me, and going in CTB mode they can shoot .. fast, the entire squad can shoot as non-stop.