When I got my first brand new board (2014) I got Union Force bindings, they're still going strong after 6 full winter seasons, never even broke a strap. I did hear that later models weren't quite so durable.
Only bindings I've ever used in anger so can't be much help but they are a mid flex.
Second for union Force - fave binding to date even if I did explode the first set in 4 days (Warranty replacement was rapid, subsequently survived a lot of trips)… previously a Ride fan but wouldn’t look back now.
When I got my first brand new board (2014) I got Union Force bindings, they're still going strong after 6 full winter seasons, never even broke a strap. I did hear that later models weren't quite so durable.
Only bindings I've ever used in anger so can't be much help but they are a mid flex.