I cam say my gunslinger is actually more mobile than my scroundel. There is less time wasted on changing good cover - fire spots during a fight than moving around in stealth, trying to find the right target to strike, avoiding aoe so not to get destealthed, etc. Besides, you do not have to stay rooted on gunslinger. With good slows to choose from, you can always escape the pissed off guy who goes after you.