I sell both the OMS and Dive Rite lines and both are fine products, your choice will most likely come down to personal preference, but in a nut shell here is what IMO the main differences. Each company was founded in a different area of the country with different types of diving as the goal when equipment was designed. Dive Rite was founded by primarily cave explorers in the central Florida region. OMS was founded in the Northeast by primarily cold water ocean wreck explorers. While both types of diving are technical in nature, they are not the same things and IMO the design of the gear reflects this. IMO Dive Rite gear uses smaller hardware and tends to be more streamlined and form fit, OMS uses larger hardware and the fit seems better for large wet or drysuits, big gloves or mits, limited visibility because of thick hoods, etc. As I said either manufacturer makes a great set of technical equipment that can be perfectly configured to meet your needs and desires for any type of diving you may want to do. Your main choice IMO will come down to what feels the best to you, what fits you the best, and what set has the options you want; and lets not forget, which one you like the look of best. Hope this helps a little.