Are you talking about Re:Flex?
Trying to give you an exact comparison would just an educated guess. We don't tear apart competitors bindings, or even put them through the testing facility. We honestly just worry about Union and our progression.
I've ridden all 3 of these though and had a good time. Flex & overall feel was quite a bit different than Union. They were comfy and rode great. Just a different feel.
Burton makes incredible stuff. They're #1 for a reason. Snowboarding is lucky to have a good leader. Can you imagine if Atomic or something like that was #1?
Do you seriously represent Union? That was the worst answer I've ever read! OP is asking for info about Unions and you tell him how Burton is #1 and how their bindings "were comfy and rode great". You really should hire Phony to replace you!