I use both. The Optilock ringmounts are solid. I also like the Leupold ring mounts and have had no issues with them. They allow a some flexibility in ring positioning for scope mounting, particularly the rear ring. Also, if you're using a smaller objective scope, you can mount the scope lower with the Leup low ringmounts.

"Good judgment comes from experience but unfortunately, experience is often derived from a series of bad judgments"