I agree they are very similar, because they've all tried to keep simplicity their first priority when designing controllers, and they all come from MCE. The problem with smartrise controller is that quality and even safety is sacrificed for simplicity. They have also several code violations. We have a pile of broken circuit boards in every machine-room with smartrise controller.
Pixel on the other hand has better quality and good technical support.
We also have a few Alpha controllers installed and are pretty happy with them. Their technical support is the best