When two boats share the same hull type — in this case both the Triton Boats 21HP 2009 and the Triton Boats SF-211 2008 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?
The power gap is worth calling out. Rated to 300 hp, the Triton Boats 21HP 2009 has a 50-hp advantage over the Triton Boats SF-211 2008's 250-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Triton Boats 21HP 2009 carries 54 gallons versus 46 gallons in the Triton Boats SF-211 2008. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 6 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: Performance buyers should lean toward the Triton Boats 21HP 2009 and its 300-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Triton Boats SF-211 2008 with its 250-hp rating is the more economical daily driver.