Both the War Eagle 436 F 2005 and the War Eagle 648VS 2013 are flat-bottom 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?
Both boats share a closely matched power ceiling - 20 hp for the War Eagle 436 F 2005 and 40 hp for the War Eagle 648VS 2013. 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 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: The War Eagle 648VS 2013 at 16,3 ft is the right call if deck space, comfort, and entertaining are top of your list. The War Eagle 436 F 2005 at 14,0 ft wins on trailering ease, likely lower purchase price, and simpler docking - a solid choice for a buyer who wants more boat for less money.