It's mostly personal preference when you get to high end bindings like these. I've used Ride Deltas before and personally, I don't like how metal bindings feel. Unions are pretty sweet although I haven't used the SLs. I've heard mostly good about the Cartels but it sounds like they tend to chew the back of your boots up quite a bit. I second the Raiden Phantoms. I haven't used the Phantoms in particular but I have the Raiden Zeros and am really high on them right now. I think the Phantoms would be a killer binding.