When two boats share the same hull type — in this case both the Bayliner 170 OB 2012 and the Bayliner GT 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 — Bayliner 170 OB 2012 at 17,5 ft versus Bayliner GT 2009 at 17,5 ft. At 1 753 lbs and 1 847 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.

Both boats share a closely matched power ceiling — 125 hp for the Bayliner 170 OB 2012 and 135 hp for the Bayliner GT 2009. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads — 21 gal and 21 gal — so range won't be a tiebreaker here.

For family outings this is probably the sharpest distinction between the two. The Bayliner GT 2009 is rated for 6 passengers, while the Bayliner 170 OB 2012 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Bayliner GT 2009 could be the deciding factor.

At this size, power-to-weight ratio matters more than outright horsepower. The Bayliner GT 2009 comes in at 14 lbs per hp versus 14 lbs per hp for the Bayliner 170 OB 2012. 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.