The Starcraft Marine Star Step 220 I/O 2011 is a modified-V design and the Starcraft Marine STX 2050 2013 is a deep-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Starcraft Marine Star Step 220 I/O 2011 at 20,3 ft versus Starcraft Marine STX 2050 2013 at 20,2 ft. Weight tells a clearer story for trailering families: the Starcraft Marine Star Step 220 I/O 2011 tips the scales at 2 325 lbs - 790 lbs more than the Starcraft Marine STX 2050 2013 at 1 535 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 - 260 hp for the Starcraft Marine Star Step 220 I/O 2011 and 250 hp for the Starcraft Marine STX 2050 2013. 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 carry nearly identical fuel loads - 51 gal and 52 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Starcraft Marine Star Step 220 I/O 2011 is rated for 12 passengers, while the Starcraft Marine STX 2050 2013 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Starcraft Marine Star Step 220 I/O 2011 could be the deciding factor.
Bottom line: Choose the Starcraft Marine Star Step 220 I/O 2011 if your priority is putting more people on the water - it handles 12 passengers and at 20,3 ft it has the deck room to back that rating up comfortably. The Starcraft Marine STX 2050 2013 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.