The Triton Boats 21X3 Pro DC 2009 vs Triton Boats TR-20X HP SC 2007 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.
The power gap is worth calling out. Rated to 300 hp, the Triton Boats 21X3 Pro DC 2009 has a 75-hp advantage over the Triton Boats TR-20X HP SC 2007's 225-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 53 gal and 54 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Triton Boats 21X3 Pro DC 2009 is rated for 6 passengers, while the Triton Boats TR-20X HP SC 2007 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 21X3 Pro DC 2009 could be the deciding factor.
Bottom line: Choose the Triton Boats 21X3 Pro DC 2009 if your priority is putting more people on the water - it handles 6 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Triton Boats TR-20X HP SC 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.