Both the Avalon 20 ft. Catalina 2011 and the Avalon Windjammer - 18 Foot 2008 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 20 ft. Catalina 2011 at 20,0 ft versus Avalon Windjammer - 18 Foot 2008 at 18,0 ft. Weight tells a clearer story for trailering families: the Avalon 20 ft. Catalina 2011 tips the scales at 1 750 lbs - 259 lbs more than the Avalon Windjammer - 18 Foot 2008 at 1 491 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 share a closely matched power ceiling - 90 hp for the Avalon 20 ft. Catalina 2011 and 75 hp for the Avalon Windjammer - 18 Foot 2008. 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. Fuel capacity breaks the other way: the Avalon Windjammer - 18 Foot 2008 carries 24 gallons versus 12 gallons in the Avalon 20 ft. Catalina 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Avalon 20 ft. Catalina 2011 is rated for 9 passengers, while the Avalon Windjammer - 18 Foot 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Avalon 20 ft. Catalina 2011 could be the deciding factor.