Both the Triumph Boats 170 CC 2009 and the Triumph Boats 190 Bay 2010 are deep-V designs, the first built in fibreglass and the second in composite, so 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 - Triumph Boats 170 CC 2009 at 16,0 ft versus Triumph Boats 190 Bay 2010 at 18,5 ft. Weight tells a clearer story for trailering families: the Triumph Boats 190 Bay 2010 tips the scales at 1 800 lbs - 700 lbs less than the Triumph Boats 170 CC 2009 at 1 100 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 150 hp, the Triumph Boats 190 Bay 2010 has a 75-hp advantage over the Triumph Boats 170 CC 2009's 75-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Triumph Boats 190 Bay 2010 carries 39 gallons versus 21 gallons in the Triumph Boats 170 CC 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
Both boats are rated for 6 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Bottom line: The Triumph Boats 190 Bay 2010 at 18,5 ft is the right call if deck space, comfort, and entertaining are top of your list. The Triumph Boats 170 CC 2009 at 16,0 ft wins on trailering ease, likely lower purchase price, and simpler docking - a solid choice for a buyer who wants more boat for less money.