Both the Premier Boats Boundary Waters 310 Sky Dek 2009 and the Premier Boats SunSpree 180 RE 2011 are pontoon 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?
Size is the most obvious dividing line here. The Premier Boats Boundary Waters 310 Sky Dek 2009 measures 31,0 feet overall (2009), giving it roughly 12,7 additional feet of deck space compared to the Premier Boats SunSpree 180 RE 2011 at 18,3 feet (2011). Weight tells a clearer story for trailering families: the Premier Boats Boundary Waters 310 Sky Dek 2009 tips the scales at 4 900 lbs - 3 400 lbs more than the Premier Boats SunSpree 180 RE 2011 at 1 500 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 350 hp, the Premier Boats Boundary Waters 310 Sky Dek 2009 has a 290-hp advantage over the Premier Boats SunSpree 180 RE 2011's 60-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Premier Boats Boundary Waters 310 Sky Dek 2009 carries 30 gallons versus 20 gallons in the Premier Boats SunSpree 180 RE 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Premier Boats Boundary Waters 310 Sky Dek 2009 is rated for 25 passengers, while the Premier Boats SunSpree 180 RE 2011 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Premier Boats Boundary Waters 310 Sky Dek 2009 could be the deciding factor.
Both are 3-tube and 2-tube pontoon designs respectively. Tube diameter and gauge affect stability and load capacity - more so than most buyers realize when comparing on paper.
Bottom line: Choose the Premier Boats Boundary Waters 310 Sky Dek 2009 if your priority is putting more people on the water - it handles 25 passengers and at 31,0 ft it has the deck room to back that rating up comfortably. The Premier Boats SunSpree 180 RE 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.