When two boats share the same hull type — in this case both the Triton Boats 18X3 DC & SC 2009 and the Triton Boats 20XS 2013 are modified vee designs with fiberglass 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?
Both boats share a closely matched power ceiling — 175 hp for the Triton Boats 18X3 DC & SC 2009 and 175 hp for the Triton Boats 20XS 2013. 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 20XS 2013 carries 46 gallons versus 37 gallons in the Triton Boats 18X3 DC & SC 2009. 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 20XS 2013 is rated for 650 passengers, while the Triton Boats 18X3 DC & SC 2009 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Triton Boats 20XS 2013 could be the deciding factor.
Bottom line: Choose the Triton Boats 20XS 2013 if your priority is putting more people on the water — it handles 650 passengers and at 20,8 ft it has the deck room to back that rating up comfortably. The Triton Boats 18X3 DC & SC 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.