When two boats share the same hull type — in this case both the Sweetwater SWT 1570 2010 and the Sweetwater SWT 1880 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 — Sweetwater SWT 1570 2010 at 15,0 ft versus Sweetwater SWT 1880 2010 at 18,0 ft. Weight tells a clearer story for trailering families: the Sweetwater SWT 1880 2010 tips the scales at 1 419 lbs — 343 lbs less than the Sweetwater SWT 1570 2010 at 1 076 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 65 hp, the Sweetwater SWT 1880 2010 has a 25-hp advantage over the Sweetwater SWT 1570 2010's 40-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 Sweetwater SWT 1880 2010 is rated for 9 passengers, while the Sweetwater SWT 1570 2010 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sweetwater SWT 1880 2010 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Sweetwater SWT 1880 2010 comes in at 22 lbs per hp versus 27 lbs per hp for the Sweetwater SWT 1570 2010. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.