When two boats share the same hull type — in this case both the Ranger 191 Cayman 2010 and the Ranger Z21 Intracoastal 2009 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 Z21 Intracoastal 2009 at 21,0 ft. Weight tells a clearer story for trailering families: the Ranger Z21 Intracoastal 2009 tips the scales at 1 875 lbs — 1 757 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 250 hp, the Ranger Z21 Intracoastal 2009 has a 50-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 191 Cayman 2010 carries 48 gallons versus 24 gallons in the Ranger Z21 Intracoastal 2009. 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 Z21 Intracoastal 2009 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 Z21 Intracoastal 2009 could be the deciding factor.
Bottom line: Choose the Ranger Z21 Intracoastal 2009 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.