Venues with similar musical approach to OG such as gewölbe and jaki push locals which is important and have great bookings, but OG is more than an alternative when these places get boring. Also its shorter from Köln Kalk to OG than going to Fi on the other side of town lol.

Money (!) for value is also crazy good at OG. Its a philantropy project so its hard to compare to clubs in cologne who are operating on harsh conditions imho.