When two boats share the same hull type — in this case both the Starcraft Marine SF 1620 SS 2009 and the Starcraft Marine Sport Runabout 185 I/O Sport 2013 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 — Starcraft Marine SF 1620 SS 2009 at 16,0 ft versus Starcraft Marine Sport Runabout 185 I/O Sport 2013 at 18,2 ft. Weight tells a clearer story for trailering families: the Starcraft Marine Sport Runabout 185 I/O Sport 2013 tips the scales at 155 lbs — 126 lbs less than the Starcraft Marine SF 1620 SS 2009 at 29 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 220 hp, the Starcraft Marine Sport Runabout 185 I/O Sport 2013 has a 180-hp advantage over the Starcraft Marine SF 1620 SS 2009's 40-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 Starcraft Marine Sport Runabout 185 I/O Sport 2013 is rated for 8 passengers, while the Starcraft Marine SF 1620 SS 2009 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine Sport Runabout 185 I/O Sport 2013 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Sport Runabout 185 I/O Sport 2013 if your priority is putting more people on the water — it handles 8 passengers and at 18,2 ft it has the deck room to back that rating up comfortably. The Starcraft Marine SF 1620 SS 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.