Having a hard time getting into Underoath

I saw Periphery was coming to a city near me on instagram, and I was stoked enough I just bought the tickets right then and there. It wasn't until later I realized they weren't headlining, but I figured I'd hold on to the tickets and still have a fun night. So I looked into Underoath and they're not really fitting my taste, so I'm looking for suggestions on their best stuff before I just say it's not for me. I don't doubt I'll still have fun, it would help if I really fucked with the music too tho.