Both the Manitou Pontoons 18 Oasis 2008 and the Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 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 - Manitou Pontoons 18 Oasis 2008 at 17,0 ft versus Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 2008 at 19,0 ft. Weight tells a clearer story for trailering families: the Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 2008 tips the scales at 2 165 lbs - 585 lbs less than the Manitou Pontoons 18 Oasis 2008 at 1 580 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 - 75 hp for the Manitou Pontoons 18 Oasis 2008 and 90 hp for the Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 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.

For family outings this is probably the sharpest distinction between the two. The Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 2008 is rated for 10 passengers, while the Manitou Pontoons 18 Oasis 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Manitou Pontoons 20 Oasis - 8 Foot 6 Inch Wide 2008 could be the deciding factor.

Both are 2-tube and 2-tube pontoon designs respectively. Tube diameter and gauge affect stability and load capacity - more so than most buyers realize when comparing on paper.