Matching a modified vee Starcraft Marine STX 186 Viper 2012 against a deep vee Starcraft Marine STX 206 Viper 2013 means you're likely deciding between two genuinely different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department — Starcraft Marine STX 186 Viper 2012 at 18,5 ft versus Starcraft Marine STX 206 Viper 2013 at 20,5 ft. Weight tells a clearer story for trailering families: the Starcraft Marine STX 186 Viper 2012 tips the scales at 1 763 lbs — 1 739 lbs more than the Starcraft Marine STX 206 Viper 2013 at 24 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 Starcraft Marine STX 206 Viper 2013 has a 125-hp advantage over the Starcraft Marine STX 186 Viper 2012's 175-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 STX 186 Viper 2012 carries 43 gallons versus 5 gallons in the Starcraft Marine STX 206 Viper 2013. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 6 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: Performance buyers should lean toward the Starcraft Marine STX 206 Viper 2013 and its 300-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Starcraft Marine STX 186 Viper 2012 with its 175-hp rating is the more economical daily driver.