Guardians can use both yes. The Power Generator has better stats on it for hitting things, whereas the shield generator gives you a chance to suffer less damage when hit. (although the chance for it to activate is really low unless you are in your tanking stance). Therefore, ideally you use the power generator when dealing damage and the shieldy thing when tanking hard stuff.
ETA for next wave is 8 AM CST iirc, will doublecheck and edit if I got it wrong. ^_^
"We'll be sending more invites tomorrow, starting from 8AM CST (6AM PST / 9AM EST / 2PM GMT / 3PM CET)." <- yup ^^
First come, first serve is the only fair, imo. (And I say that as someone who preordered late)
edit: wait how in the name of... did anyone redeem their codes in April, when preorders only opened up in July? O.o
Hi! I'm Tomas and I'm waiting for my early access... Won't be until tomorrow or the weekend though but still... Any good recommendations for games to play?