The Contender 25 Sport 2007 is a modified-V design and the Contender 28 Tournament 2013 is a deep-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Contender 25 Sport 2007 at 28,0 ft versus Contender 28 Tournament 2013 at 28,0 ft. At 4 700 lbs and 4 700 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 600 hp, the Contender 28 Tournament 2013 has a 100-hp advantage over the Contender 25 Sport 2007's 500-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 185 gal and 185 gal - so range won't be a tiebreaker here.
Both boats are rated for 8 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 Contender 28 Tournament 2013 and its 600-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Contender 25 Sport 2007 with its 500-hp rating is the more economical daily driver.