When two boats share the same hull type — in this case both the SeaArk BayMaster 2010 and the SeaArk RiverCat 180 SC 2010 are modified 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 — SeaArk BayMaster 2010 at 20,1 ft versus SeaArk RiverCat 180 SC 2010 at 18,0 ft. Weight tells a clearer story for trailering families: the SeaArk BayMaster 2010 tips the scales at 1 325 lbs — 132 lbs more than the SeaArk RiverCat 180 SC 2010 at 1 193 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 — 150 hp for the SeaArk BayMaster 2010 and 140 hp for the SeaArk RiverCat 180 SC 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.
Both boats are rated for 10 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: The SeaArk BayMaster 2010 at 20,1 ft is the right call if deck space, comfort, and entertaining are top of your list. The SeaArk RiverCat 180 SC 2010 at 18,0 ft wins on trailering ease, likely lower purchase price, and simpler docking — a solid choice for a buyer who wants more boat for less money.