Always like to install and run a cloned drive as a test. Been playing with it for several days now. Most of the issues are pretty small but if they affect you (like droplets in PS not working), then staying with Mojave makes sense. There are features in Catalina that I’ve been anxious to test, but not enough to try the beta.
Everything pretty solid so far, droplets may need to be remade as most are flagged as 32 bit, but simply remaking it solves that problem. This isn’t related to the fact they launch but don’t run (guessing this is a security setting, this has happened before with new OS release).
Note that the camera raw issues with PS and local adjustments at the end of the PS page are not an issue with the develop module in LR.