Both the Weld-Craft ECONO 2011 and the Weld-Craft RL 70 (18 ft.) 2010 are flat-bottom 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?
The Weld-Craft RL 70 (18 ft.) 2010 tops out at 40 hp. Engine specs for the Weld-Craft ECONO 2011 aren't listed - confirm with a dealer before selecting an outboard.
Bottom line: The Weld-Craft RL 70 (18 ft.) 2010 at 18,0 ft is the right call if deck space, comfort, and entertaining are top of your list. The Weld-Craft ECONO 2011 at 15,0 ft wins on trailering ease, likely lower purchase price, and simpler docking - a solid choice for a buyer who wants more boat for less money.