When two boats share the same hull type — in this case both the Alumacraft Competitor 175 CS 2012 and the Alumacraft Dominator 165 CS 2010 are deep vee designs with aluminum 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?
On paper these two are close siblings in the size department — Alumacraft Competitor 175 CS 2012 at 17,7 ft versus Alumacraft Dominator 165 CS 2010 at 16,7 ft. Weight tells a clearer story for trailering families: the Alumacraft Competitor 175 CS 2012 tips the scales at 1 285 lbs — 110 lbs more than the Alumacraft Dominator 165 CS 2010 at 1 175 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 150 hp, the Alumacraft Competitor 175 CS 2012 has a 60-hp advantage over the Alumacraft Dominator 165 CS 2010'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 Alumacraft Competitor 175 CS 2012 carries 35 gallons versus 2 gallons in the Alumacraft Dominator 165 CS 2010. 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 Alumacraft Competitor 175 CS 2012 is rated for 6 passengers, while the Alumacraft Dominator 165 CS 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Alumacraft Competitor 175 CS 2012 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Alumacraft Competitor 175 CS 2012 comes in at 9 lbs per hp versus 13 lbs per hp for the Alumacraft Dominator 165 CS 2010. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Alumacraft Competitor 175 CS 2012 if your priority is putting more people on the water — it handles 6 passengers and at 17,7 ft it has the deck room to back that rating up comfortably. The Alumacraft Dominator 165 CS 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.