Better. The px heel piece is shit. I am not a fan and I've owned a bunch of the px12-14. I happened to tear my Acl with the px12, because the release of the px is limited to say the least.
Im not going to hate on the mojo/ tyrolia 15s so much, but I will say that I have had issues with them in the past. I have had the wing on the toe piece break on a switch landing and the brake system is good, because its sturdy, but I had problems landing switch with these brakes. It was mainly because it was a major impact but this hasn't been an issue for me with fks 18.
I will say that the mojo/ tyrolia 18s are an even better binding because I believe the wings on the toe piece have more metal in them, but I have never owned the 18s only had buddies with them.
For the price of these bindings I would buy them for sure! They are sturdy and a good build with a good release in comparison to other bindings.