Both the Tahoe Pontoons 20 ft. Cascade 2012 and the Tahoe Pontoons Vista 2011 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 20 ft. Cascade 2012 at 20,0 ft versus Tahoe Pontoons Vista 2011 at 18,0 ft. At 1 750 lbs and 1 650 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 - 90 hp for the Tahoe Pontoons 20 ft. Cascade 2012 and 90 hp for the Tahoe Pontoons Vista 2011. 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 20 ft. Cascade 2012 is rated for 9 passengers, while the Tahoe Pontoons Vista 2011 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tahoe Pontoons 20 ft. Cascade 2012 could be the deciding factor.
Bottom line: Choose the Tahoe Pontoons 20 ft. Cascade 2012 if your priority is putting more people on the water - it handles 9 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Tahoe Pontoons Vista 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.