When two boats share the same hull type — in this case both the Crownline 21 SS 2013 and the Crownline 300 LS 2009 are deep vee designs with fiberglass 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?

Size is the most obvious dividing line here. The Crownline 21 SS 2013 measures 20,8 feet overall (2013), giving it roughly 17,8 additional feet of deck space compared to the Crownline 300 LS 2009 at 3,0 feet (2009). At 37 lbs and 89 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 600 hp, the Crownline 300 LS 2009 has a 280-hp advantage over the Crownline 21 SS 2013's 320-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Crownline 300 LS 2009 carries 84 gallons versus 41 gallons in the Crownline 21 SS 2013. 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 Crownline 300 LS 2009 is rated for 9 passengers, while the Crownline 21 SS 2013 caps at 1. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Crownline 300 LS 2009 could be the deciding factor.