Both the Xpress H18B 2013 and the Xpress HD20SCA 2009 are modified-V designs, both built in aluminium, 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?
On paper these two are close siblings in the size department - Xpress H18B 2013 at 18,0 ft versus Xpress HD20SCA 2009 at 20,0 ft. At 1 187 lbs and 1 190 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling - 115 hp for the Xpress H18B 2013 and 130 hp for the Xpress HD20SCA 2009. 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 Xpress HD20SCA 2009 carries 31 gallons versus 18 gallons in the Xpress H18B 2013. 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 Xpress HD20SCA 2009 is rated for 5 passengers, while the Xpress H18B 2013 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Xpress HD20SCA 2009 could be the deciding factor.
Bottom line: Choose the Xpress HD20SCA 2009 if your priority is putting more people on the water - it handles 5 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Xpress H18B 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.