Both the Bennington 2475SL I/O (3) 2009 and the Bennington 2575RLTD I/O 2009 are pontoon designs, both built in aluminium, so 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?
Both boats share a closely matched power ceiling - 320 hp for the Bennington 2475SL I/O (3) 2009 and 320 hp for the Bennington 2575RLTD I/O 2009. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
For family outings this is probably the sharpest distinction between the two. The Bennington 2475SL I/O (3) 2009 is rated for 15 passengers, while the Bennington 2575RLTD I/O 2009 caps at 12. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Bennington 2475SL I/O (3) 2009 could be the deciding factor.
Both are 2-tube and 23-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 2475SL I/O (3) 2009 if your priority is putting more people on the water - it handles 15 passengers and at 24,0 ft it has the deck room to back that rating up comfortably. The Bennington 2575RLTD I/O 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 12 that costs less to run day-to-day.