When two boats share the same hull type — in this case both the Premier Boats 310 Sky Dek RE 2011 and the Premier Boats Grand Isle 290 RF / SL 2012 are pontoon 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 — Premier Boats 310 Sky Dek RE 2011 at 31,3 ft versus Premier Boats Grand Isle 290 RF / SL 2012 at 29,4 ft. At 49 lbs and 37 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.

The power gap is worth calling out. Rated to 350 hp, the Premier Boats 310 Sky Dek RE 2011 has a 50-hp advantage over the Premier Boats Grand Isle 290 RF / SL 2012's 300-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 310 Sky Dek RE 2011 carries 53 gallons versus 47 gallons in the Premier Boats Grand Isle 290 RF / SL 2012. 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 310 Sky Dek RE 2011 is rated for 25 passengers, while the Premier Boats Grand Isle 290 RF / SL 2012 caps at 18. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Premier Boats 310 Sky Dek RE 2011 could be the deciding factor.

Both are 3-tube and 3-tube pontoon designs respectively. Tube diameter and gauge affect stability and load capacity — more so than most buyers realize when comparing on paper.