Both the Triton Boats 17 Explorer 2009 and the Triton Boats TS-17 2008 are modified-V designs, the first built in fibreglass and the second 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 - 90 hp for the Triton Boats 17 Explorer 2009 and 90 hp for the Triton Boats TS-17 2008. 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. Fuel capacity breaks the other way: the Triton Boats 17 Explorer 2009 carries 26 gallons versus 19 gallons in the Triton Boats TS-17 2008. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Triton Boats 17 Explorer 2009 is rated for 550 passengers, while the Triton Boats TS-17 2008 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Triton Boats 17 Explorer 2009 could be the deciding factor.
Bottom line: Choose the Triton Boats 17 Explorer 2009 if your priority is putting more people on the water - it handles 550 passengers and at 17,0 ft it has the deck room to back that rating up comfortably. The Triton Boats TS-17 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.