When two boats share the same hull type — in this case both the Rinker Captiva 186 FS OB 2013 and the Rinker Express Cruiser 310 EC 2012 are deep 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 Rinker Express Cruiser 310 EC 2012 measures 33,3 feet overall (2012), giving it roughly 14,6 additional feet of deck space compared to the Rinker Captiva 186 FS OB 2013 at 18,7 feet (2013). Weight tells a clearer story for trailering families: the Rinker Express Cruiser 310 EC 2012 tips the scales at 13 635 lbs — 10 960 lbs less than the Rinker Captiva 186 FS OB 2013 at 2 675 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 300 hp, the Rinker Express Cruiser 310 EC 2012 has a 150-hp advantage over the Rinker Captiva 186 FS OB 2013's 150-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Rinker Captiva 186 FS OB 2013 carries 26 gallons versus 15 gallons in the Rinker Express Cruiser 310 EC 2012. 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 Rinker Express Cruiser 310 EC 2012 is rated for 10 passengers, while the Rinker Captiva 186 FS OB 2013 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Rinker Express Cruiser 310 EC 2012 could be the deciding factor.