I don't stan either group so here's the way I see it as an outsider.
I don't think it's odd Enhypen have high sales because it's common for reality show groups to have that as the strong emotional connection is there from the start.
A lot of kpop fans made fun of the Enhypen at first for their looks and then they called the show a flop for the ratings but I could see how it was easy for ifans to watch it and be part of it. I think that made a difference.
In any case, I think that both TXT and Enhypen have really good music and to me they stand out from a lot of, if not all, new bgs so I have a feeling both of them will be even bigger in the future.
It's not like TXT is a flop. Because of the concept and music TXT have more general appeal and they have gained a lot of new fans. So, both of them will be fine.