When two boats share the same hull type — in this case both the Bayliner 170 OB 2012 and the Bayliner Discovery 288 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?

Size is the most obvious dividing line here. The Bayliner Discovery 288 2009 measures 30,6 feet overall (2009), giving it roughly 13,1 additional feet of deck space compared to the Bayliner 170 OB 2012 at 17,5 feet (2012). Weight tells a clearer story for trailering families: the Bayliner 170 OB 2012 tips the scales at 1 753 lbs — 944 lbs more than the Bayliner Discovery 288 2009 at 809 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 300 hp, the Bayliner Discovery 288 2009 has a 175-hp advantage over the Bayliner 170 OB 2012's 125-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Bayliner Discovery 288 2009 carries 113 gallons versus 21 gallons in the Bayliner 170 OB 2012. 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 Bayliner Discovery 288 2009 is rated for 10 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 Discovery 288 2009 could be the deciding factor.