When two boats share the same hull type — in this case both the Ranger 191 Cayman 2010 and the Ranger 621VS 2008 are modified vee 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?
On paper these two are close siblings in the size department — Ranger 191 Cayman 2010 at 19,1 ft versus Ranger 621VS 2008 at 21,0 ft. Weight tells a clearer story for trailering families: the Ranger 621VS 2008 tips the scales at 227 lbs — 109 lbs less than the Ranger 191 Cayman 2010 at 118 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 300 hp, the Ranger 621VS 2008 has a 100-hp advantage over the Ranger 191 Cayman 2010's 200-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Ranger 621VS 2008 carries 55 gallons versus 48 gallons in the Ranger 191 Cayman 2010. 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 Ranger 621VS 2008 is rated for 6 passengers, while the Ranger 191 Cayman 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Ranger 621VS 2008 could be the deciding factor.
Bottom line: Choose the Ranger 621VS 2008 if your priority is putting more people on the water — it handles 6 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Ranger 191 Cayman 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.