When two boats share the same hull type — in this case both the Avalon 20 ft. C Fish - Fish N Fun RE 2012 and the Avalon 21 ft. LS - Cruise 2012 are pontoon 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?
Size is the most obvious dividing line here. The Avalon 21 ft. LS - Cruise 2012 measures 21,0 feet overall (2012), giving it roughly 19,0 additional feet of deck space compared to the Avalon 20 ft. C Fish - Fish N Fun RE 2012 at 2,0 feet (2012). At 18 lbs and 18 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling — 115 hp for the Avalon 20 ft. C Fish - Fish N Fun RE 2012 and 115 hp for the Avalon 21 ft. LS - Cruise 2012. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
Both boats are rated for 10 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.
One place where both boats are genuinely identical is tube construction: both run 2 aluminum tubes at 25" diameter. That shared spec means stability and buoyancy characteristics are closely matched — the ride difference you'll feel between them comes primarily from deck length, weight distribution, and motor choice.
Bottom line: The Avalon 21 ft. LS - Cruise 2012 at 21,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Avalon 20 ft. C Fish - Fish N Fun RE 2012 at 2,0 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.