Yes, it’s good. I appreciate the Tor integration
Discussion
I use Signal with Orbot too. No problems experienced.
I guess the difference is that you either pump all traffic through Tor (works with every app) or you do it app-specific (requires apps with Orbot support).
Orbot offers menu, where you can select which from installed applications connects via Tor. I just selected Signal, Amethyst, etc... and it works.