When I arrived at home assistant, I appreciated the simplicity of zha, without knowing z2m. When I switched from sonoff v1 (no matter) to skyconnect, I wanted to test z2m out of curiosity. Apart from the slightly longer configuration, it’s a real pleasure. The support for firmware updates is very practical. There are far more parameters available for each device. The only negative point is that it takes longer to start up than zha, but that’s not really a big deal. I don’t regret switching from zha to z2m at all.