The Scout 170 Costa 2007 vs Scout 345 XSF 2010 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Scout 345 XSF 2010 measures 34,9 feet overall (2010), giving it roughly 18,9 additional feet of deck space compared to the Scout 170 Costa 2007 at 16,0 feet (2007). At 78 lbs and 91 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 power gap is worth calling out. Rated to 700 hp, the Scout 345 XSF 2010 has a 610-hp advantage over the Scout 170 Costa 2007's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Scout 345 XSF 2010 carries 33 gallons versus 3 gallons in the Scout 170 Costa 2007. 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 Scout 345 XSF 2010 is rated for 10 passengers, while the Scout 170 Costa 2007 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Scout 345 XSF 2010 could be the deciding factor.
Bottom line: Choose the Scout 345 XSF 2010 if your priority is putting more people on the water — it handles 10 passengers and at 34,9 ft it has the deck room to back that rating up comfortably. The Scout 170 Costa 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.