When two boats share the same hull type — in this case both the Stanley Boats Islander I/O 21 2011 and the Stanley Boats Mink Pleasure 18 ft. Dual Console 2010 are deep vee designs with aluminum 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 — Stanley Boats Islander I/O 21 2011 at 21,0 ft versus Stanley Boats Mink Pleasure 18 ft. Dual Console 2010 at 18,0 ft. Weight tells a clearer story for trailering families: the Stanley Boats Islander I/O 21 2011 tips the scales at 2 765 lbs — 2 753 lbs more than the Stanley Boats Mink Pleasure 18 ft. Dual Console 2010 at 12 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 220 hp, the Stanley Boats Islander I/O 21 2011 has a 130-hp advantage over the Stanley Boats Mink Pleasure 18 ft. Dual Console 2010's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
Both boats are rated for 6 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 Stanley Boats Islander I/O 21 2011 at 21,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Stanley Boats Mink Pleasure 18 ft. Dual Console 2010 at 18,0 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.