The Custom Weld 20 ft. Cobra 2012 is a deep-V design and the Custom Weld 23 - 24 ft. Custom Series 2011 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 - Custom Weld 20 ft. Cobra 2012 at 20,0 ft versus Custom Weld 23 - 24 ft. Custom Series 2011 at 23,0 ft. Weight tells a clearer story for trailering families: the Custom Weld 23 - 24 ft. Custom Series 2011 tips the scales at 4 600 lbs - 1 900 lbs less than the Custom Weld 20 ft. Cobra 2012 at 2 700 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.
Both boats share a closely matched power ceiling - 350 hp for the Custom Weld 20 ft. Cobra 2012 and 330 hp for the Custom Weld 23 - 24 ft. Custom Series 2011. 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 Custom Weld 23 - 24 ft. Custom Series 2011 carries 96 gallons versus 52 gallons in the Custom Weld 20 ft. Cobra 2012. 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 Custom Weld 23 - 24 ft. Custom Series 2011 is rated for 7 passengers, while the Custom Weld 20 ft. Cobra 2012 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Custom Weld 23 - 24 ft. Custom Series 2011 could be the deciding factor.
Bottom line: Choose the Custom Weld 23 - 24 ft. Custom Series 2011 if your priority is putting more people on the water - it handles 7 passengers and at 23,0 ft it has the deck room to back that rating up comfortably. The Custom Weld 20 ft. Cobra 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.