The Triton Boats 177 Explorer 2010 is a deep-V design and the Triton Boats 21SE 2011 is a modified-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
Size is the most obvious dividing line here. The Triton Boats 21SE 2011 measures 21,6 feet overall (2011), giving it roughly 4,0 additional feet of deck space compared to the Triton Boats 177 Explorer 2010 at 17,6 feet (2010). At 1 950 lbs and 2 002 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.
The power gap is worth calling out. Rated to 200 hp, the Triton Boats 21SE 2011 has a 110-hp advantage over the Triton Boats 177 Explorer 2010's 90-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 21SE 2011 carries 53 gallons versus 37 gallons in the Triton Boats 177 Explorer 2010. 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 21SE 2011 is rated for 675 passengers, while the Triton Boats 177 Explorer 2010 caps at 650. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Triton Boats 21SE 2011 could be the deciding factor.
Bottom line: Choose the Triton Boats 21SE 2011 if your priority is putting more people on the water - it handles 675 passengers and at 21,6 ft it has the deck room to back that rating up comfortably. The Triton Boats 177 Explorer 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 650 that costs less to run day-to-day.