Also using Orion! It’s the only one that’s convinced me it’s better than Safari, primarily because it’s actually more aggressive with power savings than Safari. The implementation to kill idle tab processes almost immediately is very effective imo.
I’ve only used it on iOS so far, but I’m a backer so I think that might mean I have a newer version than the public beta. I might try it again if that was a while ago, I had a few bugs previously that have been sorted in the more recent versions.