Do you know if Way Out West is usually good? Thinking of going to see Refused at that one... I'd love to see them on home soil! That... Or Groezrock might have to be the one.
Difficult to compare the two festivals. Depends on the musical taste you have. Groezrock is a punk/metal festival. Way Out West is a bit more of an Indie rock festival (They've had bands like Prince, Fleet Foxes, Band Of Horses, Kanye West, Bon Iver, Wilco, Arctic Monkeys, Fucked Up, Sigur Ros etc etc). I do not really know what the festival quality groezrock has, more than that they have really good line up. But I have been on the Way Out West festival and it usually is quite ridiculously good! on both the music and festival quality. The area is super nice, organic and cozy. Located in a small central park / forest and everything is neatly arranged. However, they have no camping like most festivals in Sweden so it's not particularly dirty and shabby, which is nice. Most people stay in hotels or hostels at night. I recommend it warmly!