In the UK Ofcom recently (2020) relaxed the rules on Band C channels (channel 140+) to allow for indoor non-licensed use. These have been a godsend in a crowded environment, as the lower non-DFS channels are very crowded, while the DFS channels are, well, DFS.
I use those because they are the only ones that work around here. They have lower broadcast energy and thus lower performance but better than 2.4 or getting disconnected every ten minutes.