When two boats share the same hull type — in this case both the Allison XB-21 ProSport Bass 2011 and the Allison XB-21 ProSport S.U.B. 2010 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 XB-21 ProSport Bass 2011 carries a rated maximum of 510 hp. Engine data for the Allison XB-21 ProSport S.U.B. 2010 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Both carry nearly identical fuel loads — 36 gal and 36 gal — so range won't be a tiebreaker here.

For family outings this is probably the sharpest distinction between the two. The Allison XB-21 ProSport Bass 2011 is rated for 6 passengers, while the Allison XB-21 ProSport S.U.B. 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 XB-21 ProSport Bass 2011 could be the deciding factor.