Both the Jetcraft 1875 Whitewater 2010 and the Jetcraft 1975 Fastwater 2009 are modified-V designs, both built in aluminium, 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 - Jetcraft 1875 Whitewater 2010 at 18,0 ft versus Jetcraft 1975 Fastwater 2009 at 19,0 ft. At 1 808 lbs and 1 830 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.
Both boats are rated for 5 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 Jetcraft 1875 Whitewater 2010 and Jetcraft 1975 Fastwater 2009 are closely matched on the specs that matter most. Test-ride both on the water you actually use, check current dealer pricing, and factor in long-term service access before you sign.