Honestly, if it were me I'd start both. Reason being since you have your Dubnyk against his Hiller, if Anaheim wins the game (which I think they will), then that means you're gonna need another shot at a win to tie.
That being said the peripheral stats are too close for me to feel comfortable benching anybody.
My two cents, though you should know I have a reputation for dooming goalies lol.
I'd start both. It gives you a chance to take the Wins category and anything can happen in Save %. Dubnyk played Anaheim very well last time (36 saves on 38 shots), so if you send out a prayer, he might be able to repeat. You probably won't catch your opponent in GAA, so all the more reason to give yourself more chances to take W & SV %.