The Xpress Sportsman Series - X21 Sport 2008 is a modified-V design and the Xpress Yukon 195 2009 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 - Xpress Sportsman Series - X21 Sport 2008 at 21,0 ft versus Xpress Yukon 195 2009 at 19,5 ft. At 1 583 lbs and 1 673 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 250 hp, the Xpress Sportsman Series - X21 Sport 2008 has a 25-hp advantage over the Xpress Yukon 195 2009's 225-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Xpress Sportsman Series - X21 Sport 2008 carries 40 gallons versus 30 gallons in the Xpress Yukon 195 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: Performance buyers should lean toward the Xpress Sportsman Series - X21 Sport 2008 and its 250-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Xpress Yukon 195 2009 with its 225-hp rating is the more economical daily driver.