I will agree with Seikosha. I’ve own Super 3 (same wide baffle as XRS) and used to own a pair of Super 3U (medium wide baffle, offset driver, same volume as XRS). The larger cabinet gets you a little bass. The wider baffle gives you a fuller, warmer lower midrange and upper bass. They work really well with boundary reinforcement.
Why not both? The Super 3 HO cabinet has the same volume as the Super 3 XRS. It can be ordered with the wide baffle. If you order this with a single driver you will have the best of both worlds. Remember that the lower portion of the Super 3XRS is not part of the enclosure volume - it functions as a stand.