I don't have a 17.
The 16 is Ethan's favorite while the 15 is mine.
All of the Tweeners are great hunting knives but I am partial to the 15 because it can do it all in hunting: field dressing, skinning, boning and butchering. Unless unwieldy, which the 15 is not, a knife is not too big for deer hunting - especially if having one knife do it all is in play.
The 15 also excels at those often overlooked but ever present necessities of any deer camp knife - the ability make a PB&J as well as the significantly important functionality of slicing pepperoni and cheese! Lastly, the 15 is the champ of the three at food prep and, at least the way we deer hunt, fooding and eating are integral to the hunt.