i like lemmy a lot. i also like that piefed seems to have better mod tools (at least i am told so). as one of the many people who lost their lemm.ee account to mod burnout, i think the important thing is what you like to work on.
if you can only support one plattform, choose the one you like better - i will most likely follow db0 for its governance.
if you can support both platforms and have fun doing so, i don't see a downside in it.