When two boats share the same hull type — in this case both the Stamas 290 Express Inboard 2006 and the Stamas 320 Express Outboard 2011 are modified vee designs with fiberglass construction — 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?

Size is the most obvious dividing line here. The Stamas 320 Express Outboard 2011 measures 34,4 feet overall (2011), giving it roughly 3,4 additional feet of deck space compared to the Stamas 290 Express Inboard 2006 at 31,0 feet (2006). At 68 lbs and 127 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.

The Stamas 290 Express Inboard 2006 carries a rated maximum of 500 hp. Engine data for the Stamas 320 Express Outboard 2011 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Stamas 320 Express Outboard 2011 carries 316 gallons versus 208 gallons in the Stamas 290 Express Inboard 2006. 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 Stamas 320 Express Outboard 2011 is rated for 10 passengers, while the Stamas 290 Express Inboard 2006 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Stamas 320 Express Outboard 2011 could be the deciding factor.