The Steiger Craft 21 DV Long Beach 2008 is a deep-V design and the Steiger Craft Block Island 25 2010 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.
On paper these two are close siblings in the size department - Steiger Craft 21 DV Long Beach 2008 at 21,0 ft versus Steiger Craft Block Island 25 2010 at 24,0 ft. Weight tells a clearer story for trailering families: the Steiger Craft Block Island 25 2010 tips the scales at 5 000 lbs - 700 lbs less than the Steiger Craft 21 DV Long Beach 2008 at 4 300 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 300 hp, the Steiger Craft Block Island 25 2010 has a 75-hp advantage over the Steiger Craft 21 DV Long Beach 2008's 225-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Steiger Craft Block Island 25 2010 is rated for 7 passengers, while the Steiger Craft 21 DV Long Beach 2008 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Steiger Craft Block Island 25 2010 could be the deciding factor.
Bottom line: Choose the Steiger Craft Block Island 25 2010 if your priority is putting more people on the water - it handles 7 passengers and at 24,0 ft it has the deck room to back that rating up comfortably. The Steiger Craft 21 DV Long Beach 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.