Both the Velocity 300 Xover 2009 and the Velocity 400 Xover 2009 are modified-V designs, both built in composite, 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?
Size is the most obvious dividing line here. The Velocity 400 Xover 2009 measures 39,0 feet overall (2009), giving it roughly 4,0 additional feet of deck space compared to the Velocity 300 Xover 2009 at 35,0 feet (2009). Weight tells a clearer story for trailering families: the Velocity 300 Xover 2009 tips the scales at 7 200 lbs - 200 lbs more than the Velocity 400 Xover 2009 at 7 000 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 Velocity 400 Xover 2009 has a 298-hp advantage over the Velocity 300 Xover 2009's 2-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Velocity 400 Xover 2009 carries 400 gallons versus 220 gallons in the Velocity 300 Xover 2009. 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 Velocity 400 Xover 2009 is rated for 11 passengers, while the Velocity 300 Xover 2009 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Velocity 400 Xover 2009 could be the deciding factor.
Bottom line: Choose the Velocity 400 Xover 2009 if your priority is putting more people on the water - it handles 11 passengers and at 39,0 ft it has the deck room to back that rating up comfortably. The Velocity 300 Xover 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.