When two boats share the same hull type — in this case both the Duffy 21 Sun Cruiser 2013 and the Duffy 22 Bay Island 2013 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 — Duffy 21 Sun Cruiser 2013 at 21,0 ft versus Duffy 22 Bay Island 2013 at 22,0 ft. Weight tells a clearer story for trailering families: the Duffy 22 Bay Island 2013 tips the scales at 4 315 lbs — 4 311 lbs less than the Duffy 21 Sun Cruiser 2013 at 4 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.
Both boats are rated for 12 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 Duffy 21 Sun Cruiser 2013 and Duffy 22 Bay Island 2013 are closely matched on the specs that matter most. Test-ride both on the water you actually use, check current dealer pricing, and factor in long-term service access before you sign.