When two boats share the same hull type — in this case both the Avalon 29 ft. Excalibur 2011 and the Avalon Windjammer - 20 Foot 2008 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 29 ft. Excalibur 2011 measures 29,0 feet overall (2011), giving it roughly 27,0 additional feet of deck space compared to the Avalon Windjammer - 20 Foot 2008 at 2,0 feet (2008). At 285 lbs and 187 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.
The power gap is worth calling out. Rated to 200 hp, the Avalon 29 ft. Excalibur 2011 has a 110-hp advantage over the Avalon Windjammer - 20 Foot 2008's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Avalon 29 ft. Excalibur 2011 carries 36 gallons versus 24 gallons in the Avalon Windjammer - 20 Foot 2008. 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 29 ft. Excalibur 2011 is rated for 16 passengers, while the Avalon Windjammer - 20 Foot 2008 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Avalon 29 ft. Excalibur 2011 could be the deciding factor.
Bottom line: Choose the Avalon 29 ft. Excalibur 2011 if your priority is putting more people on the water — it handles 16 passengers and at 29,0 ft it has the deck room to back that rating up comfortably. The Avalon Windjammer - 20 Foot 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 9 that costs less to run day-to-day.