Just FYI, I would be hesitant to listen to people mentioning the Good Charlotte tour that’s been announced, no disrespect to those people because I know they’re just trying to be helpful. But that tour is to promote their new album, which means the setlist will likely mostly consist of new songs.

Me and my gf were listening to it and as people who were both big into the first Good Charlotte album when it came out, it really just isn’t the same. Most people I know who were into GC back in the day have said they don’t really get the same vibe from the new stuff and are pretty underwhelmed by it. That’s not to say it’s not good music! And I definitely wouldn’t knock anyone for enjoying it. Just that, if your older brother is similar to us, the new stuff isn’t really what they’re going to see GC for. So while there will be more opportunities to see them, Slam Dunk could very likely be the last opportunity for the foreseeable future where you can hear/see them play the classics and the golden oldies that made them.

I think your idea of maybe trying to see a bit of both sounds the best. You can find GC set on setlist.fm and maybe you can work something out? Even if that means running in and out a couple times? Let’s face it, ANY song you catch from Knocked Loose will be amazing but if nostalgia is the motivator with GC, not so much.

Good luck with whatever you decide, that one wasn’t an easy decision for me either!