Both the Starcraft Marine 2100 RE 2008 and the Starcraft Marine Sport Runabout 185 I/O Sport 2013 are modified-V designs, both built in fibreglass, 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 - Starcraft Marine 2100 RE 2008 at 21,0 ft versus Starcraft Marine Sport Runabout 185 I/O Sport 2013 at 18,2 ft. Weight tells a clearer story for trailering families: the Starcraft Marine 2100 RE 2008 tips the scales at 2 300 lbs - 750 lbs more than the Starcraft Marine Sport Runabout 185 I/O Sport 2013 at 1 550 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.

The power gap is worth calling out. Rated to 220 hp, the Starcraft Marine Sport Runabout 185 I/O Sport 2013 has a 214-hp advantage over the Starcraft Marine 2100 RE 2008's 6-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Starcraft Marine 2100 RE 2008 carries 45 gallons versus 23 gallons in the Starcraft Marine Sport Runabout 185 I/O Sport 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 Starcraft Marine 2100 RE 2008 is rated for 12 passengers, while the Starcraft Marine Sport Runabout 185 I/O Sport 2013 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine 2100 RE 2008 could be the deciding factor.