I have a janky left knee. I'd been using an Asterisk Cell brace for 10 years. I just recently replaced it with a DonJoy se-4 which I think I like. The Asterisk was solid. I was always confident in it. The lacing system held well but it was big/bulky and after 10 years was falling apart. The DonJoy is light/slim, and takes some care when putting on, but when you get a feel for it, it stays in place damn well. So far (about 2 weeks) it seems to be great.
For wrists, I sometimes wear a wrist guard. I like the 661 wrist guards. They're made for moto, so the leave your hand free , don't have the plastic splints which suck when you slide out on them, and they're pretty comfortable. It's not as much protection as a plastic guard, but it suits me. I only wear them if I have a bruise though that I don't want to continue to get worse while I keep skating.