When two boats share the same hull type — in this case both the Ultra Cat 20 XS 2007 and the Ultra Cat 23 XS 2007 are tunnel designs with fiberglass construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
Size is the most obvious dividing line here. The Ultra Cat 23 XS 2007 measures 23,0 feet overall (2007), giving it roughly 21,0 additional feet of deck space compared to the Ultra Cat 20 XS 2007 at 2,0 feet (2007). Weight tells a clearer story for trailering families: the Ultra Cat 20 XS 2007 tips the scales at 119 lbs — 101 lbs more than the Ultra Cat 23 XS 2007 at 18 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 225 hp, the Ultra Cat 23 XS 2007 has a 50-hp advantage over the Ultra Cat 20 XS 2007's 175-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Ultra Cat 23 XS 2007 carries 58 gallons versus 38 gallons in the Ultra Cat 20 XS 2007. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Ultra Cat 23 XS 2007 is rated for 7 passengers, while the Ultra Cat 20 XS 2007 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Ultra Cat 23 XS 2007 could be the deciding factor.
Bottom line: Choose the Ultra Cat 23 XS 2007 if your priority is putting more people on the water — it handles 7 passengers and at 23,0 ft it has the deck room to back that rating up comfortably. The Ultra Cat 20 XS 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.