When two boats share the same hull type — in this case both the Campion Allante 645i BR 2013 and the Campion Allante 705i SC 2012 are deep vee designs with fiberglass 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 — Campion Allante 645i BR 2013 at 25,1 ft versus Campion Allante 705i SC 2012 at 26,2 ft. Weight tells a clearer story for trailering families: the Campion Allante 645i BR 2013 tips the scales at 4 037 lbs — 3 582 lbs more than the Campion Allante 705i SC 2012 at 455 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 430 hp, the Campion Allante 705i SC 2012 has a 50-hp advantage over the Campion Allante 645i BR 2013's 380-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Campion Allante 705i SC 2012 carries 69 gallons versus 56 gallons in the Campion Allante 645i BR 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 9 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.