The Starcraft Marine Nexstar 2010 I/O 2006 vs Starcraft Marine Nexstar 2100 I/O 2006 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.
On paper these two are close siblings in the size department - Starcraft Marine Nexstar 2010 I/O 2006 at 19,0 ft versus Starcraft Marine Nexstar 2100 I/O 2006 at 21,0 ft. Weight tells a clearer story for trailering families: the Starcraft Marine Nexstar 2100 I/O 2006 tips the scales at 2 300 lbs - 200 lbs less than the Starcraft Marine Nexstar 2010 I/O 2006 at 2 100 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 350 hp, the Starcraft Marine Nexstar 2010 I/O 2006 has a 344-hp advantage over the Starcraft Marine Nexstar 2100 I/O 2006's 6-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 45 gal and 45 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine Nexstar 2100 I/O 2006 is rated for 12 passengers, while the Starcraft Marine Nexstar 2010 I/O 2006 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine Nexstar 2100 I/O 2006 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Nexstar 2100 I/O 2006 if your priority is putting more people on the water - it handles 12 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Starcraft Marine Nexstar 2010 I/O 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.