Big fan of THX 1138, I believe it would’ve been much better known and respected if it wasn’t overshadowed by Star Wars. I actually prefer THX 1138, but I haven’t seen it in a long time as I don’t think there’s a high-quality transfer - without the CGI retouchings - widely available.
And Zardoz is a punchline for good reason, but I still find it an interesting film. It’s got bizarre, creative worldbuilding, and I love that final shot.