When two boats share the same hull type — in this case both the Sweetwater SW 1986 RE3 2009 and the Sweetwater SW 2186 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 SW 1986 RE3 2009 at 19,0 ft versus Sweetwater SW 2186 2010 at 21,2 ft. Weight tells a clearer story for trailering families: the Sweetwater SW 1986 RE3 2009 tips the scales at 2 175 lbs — 660 lbs more than the Sweetwater SW 2186 2010 at 1 515 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 115 hp, the Sweetwater SW 2186 2010 has a 40-hp advantage over the Sweetwater SW 1986 RE3 2009's 75-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 24 gal and 24 gal — so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Sweetwater SW 2186 2010 is rated for 9 passengers, while the Sweetwater SW 1986 RE3 2009 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sweetwater SW 2186 2010 could be the deciding factor.
Bottom line: Choose the Sweetwater SW 2186 2010 if your priority is putting more people on the water — it handles 9 passengers and at 21,2 ft it has the deck room to back that rating up comfortably. The Sweetwater SW 1986 RE3 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.