When two boats share the same hull type — in this case both the Harris Flotebote Grand Mariner 250 SEL 2009 and the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 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?

On paper these two are close siblings in the size department — Harris Flotebote Grand Mariner 250 SEL 2009 at 27,0 ft versus Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 at 25,0 ft. Weight tells a clearer story for trailering families: the Harris Flotebote Grand Mariner 250 SEL 2009 tips the scales at 461 lbs — 429 lbs more than the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 at 32 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.

The power gap is worth calling out. Rated to 300 hp, the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 has a 40-hp advantage over the Harris Flotebote Grand Mariner 250 SEL 2009's 260-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.

For family outings this is probably the sharpest distinction between the two. The Harris Flotebote Grand Mariner 250 SEL 2009 is rated for 16 passengers, while the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 caps at 14. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Harris Flotebote Grand Mariner 250 SEL 2009 could be the deciding factor.