Both are great and their debut albums are awesome, but at this point I'm kinda getting obsessed with 5SOS. I've loved their album ever since the first listen and all 22 songs are really solid. I think I already love them more than 1D, even though the latter has more material. But their second album was lacking what their debut had and Midnight Memories was great but wasn't as addicting / didn't have as much replay value as I thought it should've.