When two boats share the same hull type — in this case both the Vectra V-162 OB 2007 and the Vectra V-172 IO 2009 are modified 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?

On paper these two are close siblings in the size department — Vectra V-162 OB 2007 at 15,0 ft versus Vectra V-172 IO 2009 at 16,0 ft. At 142 lbs and 155 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 220 hp, the Vectra V-172 IO 2009 has a 130-hp advantage over the Vectra V-162 OB 2007's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 23 gal and 23 gal — so range won't be a tiebreaker here.

For family outings this is probably the sharpest distinction between the two. The Vectra V-172 IO 2009 is rated for 8 passengers, while the Vectra V-162 OB 2007 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Vectra V-172 IO 2009 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Vectra V-172 IO 2009 comes in at 1 lbs per hp versus 2 lbs per hp for the Vectra V-162 OB 2007. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.