Which shields can be used by a ranger or a sentinel?

[Kirman]

I have both Warden and Sentinel. The day i crafted ''Frostfang'' never played with my Warden again. I can't remember how many times i saved the shieldwall by killing a bot who slip trough or saving the minmax ranged players by killing assassins/tricksters.. Of course Warden is much better for shooting but as long as you headshot you won't feel the difference. The only thing i've noticed is the Stag Bow feels slow on  Sentinel.