Harper is the better of the two, but WWE was never really sold on him as a singles performer, aside from that weird month long IC Title reign in which he won the title from Ziggler only to lose it back in the rematch in a ladder match at the very next PPV, so he may just be off TV as well. Sucks as I think Harper is underrated.
I do like the two as a team, going back to them under Wyatt they did good work. Rowen isn't a star, but for a guy that big he can move a bit and uses his size well, but this is the third time since he was called up that he has had an injury issue that will force him to miss extended time, so I do worry a bit. Obviously injuries happen and it isn't like he hurt his arm on purpose, but he wouldn't be the first guy WWE pushed to the back of the line due to injury issues.