Both the Steiger Craft Chesapeake/Miami 21 2010 and the Steiger Craft Super Fly 21 2008 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 - Steiger Craft Chesapeake/Miami 21 2010 at 20,0 ft versus Steiger Craft Super Fly 21 2008 at 20,0 ft. Weight tells a clearer story for trailering families: the Steiger Craft Chesapeake/Miami 21 2010 tips the scales at 3 400 lbs - 500 lbs more than the Steiger Craft Super Fly 21 2008 at 2 900 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.
Both boats share a closely matched power ceiling - 200 hp for the Steiger Craft Chesapeake/Miami 21 2010 and 200 hp for the Steiger Craft Super Fly 21 2008. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup.
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: The Steiger Craft Chesapeake/Miami 21 2010 and Steiger Craft Super Fly 21 2008 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.