When two boats share the same hull type — in this case both the Allison XB-21 ProSport Bass 2010 and the Allison XS-2003 Grandsport 2011 are modified vee designs with composite 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?

The Allison XS-2003 Grandsport 2011 tops out at 450 hp. Engine specs for the Allison XB-21 ProSport Bass 2010 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Allison XB-21 ProSport Bass 2010 carries 36 gallons versus 3 gallons in the Allison XS-2003 Grandsport 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 Allison XS-2003 Grandsport 2011 is rated for 6 passengers, while the Allison XB-21 ProSport Bass 2010 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Allison XS-2003 Grandsport 2011 could be the deciding factor.