I got to know the developer of Fyrox, MrDimas, and commissioned him to implement blend shapes (morph targets) in the engine, as they had been missing. He's an amazing engineer and got it done quickly.
I then took the same task to Bevy. There are so many more people in the community. One of them stepped up right away and I commissioned him to implement similarly missing blend shapes. Same excellent engineering and delivery, but there were thirty times more people asking and involved in the process.
Bevy has community. Fyrox is a one man show.
Fyrox was ahead of Bevy a little bit, but Bevy has taken the time to develop community and has made much more important and sound architectural choices for becoming a much bigger project and engine.
If I had to recommend either, it'd 100% be Bevy. No hate or dunking on MrDimas, either, because he's an amazing engineer and has built something incredible. But Bevy absolutely appears to be the future, and their community is not going away.
I dismissed fyrox, I was initially interested in their real time scene renderer, but it terribly lags in my environment. I still think it has a nice architecture.
Good luck with your project!