Both the Scout 190 Costa 2009 and the Scout 191 Bay Scout 2011 are modified-V designs, both built in fibreglass, 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 - Scout 190 Costa 2009 at 19,0 ft versus Scout 191 Bay Scout 2011 at 18,8 ft. At 1 300 lbs and 1 300 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 225 hp, the Scout 190 Costa 2009 has a 75-hp advantage over the Scout 191 Bay Scout 2011's 150-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 45 gal and 42 gal - so range won't be a tiebreaker here.
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: Performance buyers should lean toward the Scout 190 Costa 2009 and its 225-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Scout 191 Bay Scout 2011 with its 150-hp rating is the more economical daily driver.