Both the Avalon Somerset 22 ft. 2009 and the Avalon Tropic 20 ft. 2010 are pontoon designs, both built in aluminium, so 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 - Avalon Somerset 22 ft. 2009 at 22,0 ft versus Avalon Tropic 20 ft. 2010 at 20,0 ft. Weight tells a clearer story for trailering families: the Avalon Somerset 22 ft. 2009 tips the scales at 2 050 lbs - 300 lbs more than the Avalon Tropic 20 ft. 2010 at 1 750 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 125 hp, the Avalon Somerset 22 ft. 2009 has a 35-hp advantage over the Avalon Tropic 20 ft. 2010's 90-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Avalon Somerset 22 ft. 2009 is rated for 11 passengers, while the Avalon Tropic 20 ft. 2010 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Avalon Somerset 22 ft. 2009 could be the deciding factor.
Bottom line: Choose the Avalon Somerset 22 ft. 2009 if your priority is putting more people on the water - it handles 11 passengers and at 22,0 ft it has the deck room to back that rating up comfortably. The Avalon Tropic 20 ft. 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 9 that costs less to run day-to-day.