The Xpress Tunnel - 1756T 2008 is a flat-bottom design and the Xpress X19SS 2011 is a modified-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 Tunnel - 1756T 2008 at 17,0 ft versus Xpress X19SS 2011 at 19,0 ft. Weight tells a clearer story for trailering families: the Xpress X19SS 2011 tips the scales at 1 390 lbs - 890 lbs less than the Xpress Tunnel - 1756T 2008 at 500 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 200 hp, the Xpress X19SS 2011 has a 160-hp advantage over the Xpress Tunnel - 1756T 2008's 40-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
Both boats are rated for 4 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 X19SS 2011 and its 200-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Xpress Tunnel - 1756T 2008 with its 40-hp rating is the more economical daily driver.