If you've never seen Ensiferum yet, go see them. I mean if you're a big fan of both bands. Otherwise go see Behemoth/Dimmu. Ensiferum are godly live, and I'm hyped to see Turisas... but if I had to choose, I'd go see Borgir because I'm a huge Vortex fanboy and I have already seen Ensiferum 2 times. Dimmu will be back in a year, who knows about the Paganfest bands.