The Steel clip is a little better, for retention, than the plastic clip. However, it's not in the same realm of retention as pull the dot loops. Anything that is that easy to take off your belt (steel or plastic clip) is "that easy to come off your belt should you get into a car wreck, wrestling match, etc". The pull the dot loops are still my preferred "don't have to thread them through your belt" loops that are stable and secure. The Discreet Carry Concepts are awesome, but require a bit more technique and practice to use, but they are phenomenal for concealment, security and keeping the gun oriented while going about your day. We are working on incorporating them into our AIWB/George designs.
Hope that helps, let me know if you have any specific questions for me.
sales@jmcustomkydex.com