The Sea Ray 300 Select EX 2008 is a modified-V design and the Sea Ray 390 Sedan Bridge 2010 is a semi-displacement 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.

The power gap is worth calling out. Rated to 370 hp, the Sea Ray 390 Sedan Bridge 2010 has a 50-hp advantage over the Sea Ray 300 Select EX 2008's 320-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sea Ray 390 Sedan Bridge 2010 carries 300 gallons versus 130 gallons in the Sea Ray 300 Select EX 2008. 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 Sea Ray 390 Sedan Bridge 2010 is rated for 11 passengers, while the Sea Ray 300 Select EX 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea Ray 390 Sedan Bridge 2010 could be the deciding factor.