When two boats share the same hull type — in this case both the Ranger 173 Ghost 2009 and the Ranger 191 Cayman 2010 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 173 Ghost 2009 at 17,0 ft versus Ranger 191 Cayman 2010 at 19,1 ft. Weight tells a clearer story for trailering families: the Ranger 173 Ghost 2009 tips the scales at 985 lbs — 867 lbs more 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 200 hp, the Ranger 191 Cayman 2010 has a 85-hp advantage over the Ranger 173 Ghost 2009's 115-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 3 gallons in the Ranger 173 Ghost 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 5 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Ranger 191 Cayman 2010 at 19,1 ft is the right call if deck space, comfort, and entertaining are top of your list. The Ranger 173 Ghost 2009 at 17,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.