Both the Landau Harbor Cruise 20 2011 and the Landau Limited Edition 18 Cruise 2008 are pontoon designs, the first built in aluminium and the second in fibreglass, 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 - Landau Harbor Cruise 20 2011 at 20,0 ft versus Landau Limited Edition 18 Cruise 2008 at 18,0 ft. Weight tells a clearer story for trailering families: the Landau Harbor Cruise 20 2011 tips the scales at 1 699 lbs - 378 lbs more than the Landau Limited Edition 18 Cruise 2008 at 1 321 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 Landau Harbor Cruise 20 2011 and 75 hp for the Landau Limited Edition 18 Cruise 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 Landau Harbor Cruise 20 2011 is rated for 8 passengers, while the Landau Limited Edition 18 Cruise 2008 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Landau Harbor Cruise 20 2011 could be the deciding factor.

Both are 23-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.