When two boats share the same hull type — in this case both the Bennington 1850FS 2008 and the Bennington 23 SL I/O 2011 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?
Size is the most obvious dividing line here. The Bennington 23 SL I/O 2011 measures 22,3 feet overall (2011), giving it roughly 4,3 additional feet of deck space compared to the Bennington 1850FS 2008 at 18,0 feet (2008). Weight tells a clearer story for trailering families: the Bennington 23 SL I/O 2011 tips the scales at 2 811 lbs — 902 lbs less than the Bennington 1850FS 2008 at 1 909 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 60 hp, the Bennington 1850FS 2008 has a 28-hp advantage over the Bennington 23 SL I/O 2011's 32-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 Bennington 1850FS 2008 is rated for 23 passengers, while the Bennington 23 SL I/O 2011 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Bennington 1850FS 2008 could be the deciding factor.
Both are 2-tube and 3-tube pontoon designs respectively. Tube diameter and gauge affect stability and load capacity — more so than most buyers realize when comparing on paper.
Bottom line: Choose the Bennington 1850FS 2008 if your priority is putting more people on the water — it handles 23 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Bennington 23 SL I/O 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 12 that costs less to run day-to-day.