Leupold offer two types of quick release bases (actually three). The two popular types are the QR and QRW. I've used both. The QR uses a post and cam concept, the QRW uses Weaver bases. For hunting, I find the return to zero quite acceptable. However, I had to return my QR type mounts because the cam lever began to rotate a full 360 and would no longer lock down. They messaged me and informed me that they were 'worn past repair'. At my request, they were replaced with the QRW type.
So, in my opinion, the QRW type are more robust.