When two boats share the same hull type — in this case both the SeaArk BayRunner 2012 and the SeaArk XV180 (SC) 2012 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 BayRunner 2012 at 20,1 ft versus SeaArk XV180 (SC) 2012 at 18,0 ft. Weight tells a clearer story for trailering families: the SeaArk XV180 (SC) 2012 tips the scales at 905 lbs — 786 lbs less than the SeaArk BayRunner 2012 at 119 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 140 hp, the SeaArk BayRunner 2012 has a 50-hp advantage over the SeaArk XV180 (SC) 2012's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The SeaArk BayRunner 2012 is rated for 6 passengers, while the SeaArk XV180 (SC) 2012 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the SeaArk BayRunner 2012 could be the deciding factor.
Bottom line: Choose the SeaArk BayRunner 2012 if your priority is putting more people on the water — it handles 6 passengers and at 20,1 ft it has the deck room to back that rating up comfortably. The SeaArk XV180 (SC) 2012 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.