Both the Triton Boats 21HP 2012 and the Triton Boats DV 186 DC Mag 2007 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?
On paper these two are close siblings in the size department - Triton Boats 21HP 2012 at 21,0 ft versus Triton Boats DV 186 DC Mag 2007 at 18,0 ft. At 1 840 lbs and 1 770 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling - 200 hp for the Triton Boats 21HP 2012 and 200 hp for the Triton Boats DV 186 DC Mag 2007. 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 21HP 2012 carries 46 gallons versus 40 gallons in the Triton Boats DV 186 DC Mag 2007. 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 21HP 2012 is rated for 675 passengers, while the Triton Boats DV 186 DC Mag 2007 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Triton Boats 21HP 2012 could be the deciding factor.
Bottom line: Choose the Triton Boats 21HP 2012 if your priority is putting more people on the water - it handles 675 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Triton Boats DV 186 DC Mag 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.