When two boats share the same hull type — in this case both the Alumacraft Competitor 165 CS 2013 and the Alumacraft Navigator 175 Tiller 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 165 CS 2013 at 16,6 ft versus Alumacraft Navigator 175 Tiller 2010 at 17,7 ft. Weight tells a clearer story for trailering families: the Alumacraft Navigator 175 Tiller 2010 tips the scales at 1 145 lbs — 1 049 lbs less than the Alumacraft Competitor 165 CS 2013 at 96 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.
Both boats share a closely matched power ceiling — 90 hp for the Alumacraft Competitor 165 CS 2013 and 75 hp for the Alumacraft Navigator 175 Tiller 2010. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Fuel capacity breaks the other way: the Alumacraft Navigator 175 Tiller 2010 carries 38 gallons versus 17 gallons in the Alumacraft Competitor 165 CS 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 Alumacraft Competitor 165 CS 2013 is rated for 6 passengers, while the Alumacraft Navigator 175 Tiller 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 165 CS 2013 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Alumacraft Competitor 165 CS 2013 comes in at 1 lbs per hp versus 15 lbs per hp for the Alumacraft Navigator 175 Tiller 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 165 CS 2013 if your priority is putting more people on the water — it handles 6 passengers and at 16,6 ft it has the deck room to back that rating up comfortably. The Alumacraft Navigator 175 Tiller 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.