It sounds like you are already aware of the pros and cons of increasing in glove size. I typically like going to route of a smaller glove because of the ease of transfers and overall control. Ultimately, it will be your decision to weigh those factors but the All Star Pro Elite Series Baseball Catcher's Mitt: CM3000SBT is a great glove.
The CM3000SBT is made with the highest quality leather from All Star's Japanese Steerhide leather stock, resulting in a glove designed to handle the highest pitch velocities and last a very long time, as well as a reinforced web design.
When comparing the pocket depth of the All Star Pro Elite Series: CM3000SBT Catcher's Mitt to that of other catcher mitts with the same 33.50 inch design one will not find much of a difference. As to what catcher's mitt will have the largest pocket, that would a tie between the All Star models that are 35 inch patterns and the 35 inch Marucci Pro Founders' Series model.