The Caddo Rolled Gunnel 190 OB Vee Hull 2010 is a modified-V design and the Caddo Rolled Gunnel 218 OB Tunnel Hull 2010 is a tunnel hull 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 - 150 hp for the Caddo Rolled Gunnel 190 OB Vee Hull 2010 and 150 hp for the Caddo Rolled Gunnel 218 OB Tunnel Hull 2010. 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 Caddo Rolled Gunnel 218 OB Tunnel Hull 2010 carries 47 gallons versus 31 gallons in the Caddo Rolled Gunnel 190 OB Vee Hull 2010. 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 Caddo Rolled Gunnel 218 OB Tunnel Hull 2010 is rated for 7 passengers, while the Caddo Rolled Gunnel 190 OB Vee Hull 2010 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Caddo Rolled Gunnel 218 OB Tunnel Hull 2010 could be the deciding factor.
Bottom line: Choose the Caddo Rolled Gunnel 218 OB Tunnel Hull 2010 if your priority is putting more people on the water - it handles 7 passengers and at 21,7 ft it has the deck room to back that rating up comfortably. The Caddo Rolled Gunnel 190 OB Vee Hull 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.