Both the Stanley Boats Islander 19 ft. 2012 and the Stanley Boats Islander Runabout 19 2011 are deep-V designs, both built in aluminium, so 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 - Stanley Boats Islander 19 ft. 2012 at 19,3 ft versus Stanley Boats Islander Runabout 19 2011 at 19,0 ft. At 1 725 lbs and 1 725 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
Both boats share a closely matched power ceiling - 150 hp for the Stanley Boats Islander 19 ft. 2012 and 150 hp for the Stanley Boats Islander Runabout 19 2011. 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.
For family outings this is probably the sharpest distinction between the two. The Stanley Boats Islander 19 ft. 2012 is rated for 8 passengers, while the Stanley Boats Islander Runabout 19 2011 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Stanley Boats Islander 19 ft. 2012 could be the deciding factor.
Bottom line: Choose the Stanley Boats Islander 19 ft. 2012 if your priority is putting more people on the water - it handles 8 passengers and at 19,3 ft it has the deck room to back that rating up comfortably. The Stanley Boats Islander Runabout 19 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.