The Sea Ray 300 Select EX 2008 is a modified-V design and the Sea Ray 310 Sundancer 2008 is a deep-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.

Both boats share a closely matched power ceiling - 320 hp for the Sea Ray 300 Select EX 2008 and 320 hp for the Sea Ray 310 Sundancer 2008. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Sea Ray 310 Sundancer 2008 carries 200 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 310 Sundancer 2008 is rated for 10 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 310 Sundancer 2008 could be the deciding factor.