Just FYI, I demoed Oxygen. It's a whole other way of doing things. On the one hand, it's amazing. On the other it's intimidating. Once you wrap your head around it, you can do things quite quickly, but I decided I'm more comfortable with traditional themes.
Among other things, with a traditional theme, I make my key changes in themes and plugins, which means they are in version control. There's probably a way to export Oxygen settings and do version control.
Currently, I'm mostly working with Generatepress. Two sites in the last few months with GP and about to do another one. It's quite fast unless you start adding things to slow it down. I hear Astra is also very fast, but I have not tested it and in most tests I saw, Generatepress ended up faster and lighter, and they have a much more attractive pricing model on their premium version.
