Both the Tahoe Pontoons 21 ft. LT 2011 and the Tahoe Pontoons Sierra 22 ft. 2009 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 - Tahoe Pontoons 21 ft. LT 2011 at 21,0 ft versus Tahoe Pontoons Sierra 22 ft. 2009 at 22,0 ft. Weight tells a clearer story for trailering families: the Tahoe Pontoons Sierra 22 ft. 2009 tips the scales at 2 050 lbs - 250 lbs less than the Tahoe Pontoons 21 ft. LT 2011 at 1 800 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 - 115 hp for the Tahoe Pontoons 21 ft. LT 2011 and 125 hp for the Tahoe Pontoons Sierra 22 ft. 2009. 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.
For family outings this is probably the sharpest distinction between the two. The Tahoe Pontoons Sierra 22 ft. 2009 is rated for 11 passengers, while the Tahoe Pontoons 21 ft. LT 2011 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tahoe Pontoons Sierra 22 ft. 2009 could be the deciding factor.
Bottom line: Choose the Tahoe Pontoons Sierra 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 Tahoe Pontoons 21 ft. LT 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.