My reasoning for picking up a 24 (a month after I got the 14) was because it was D2-semi-stainless and better edge holding capabilities. Thinking this would work well as a deer processing blade. All of the Hype on here when it finally became available might have had something to do with it too.
After using them for a summer, along with the 15 that came a month later, I decided that I will probably use the 15 as my main field dressing and skinning blade. I have become really fond of the trailing point and edge geometry.
The 24 will not be far away. The curve on the front part of the 24's blade has proven to be quite helpful for fine work requiring a light push cut.
If I could have only one Becker for hunting (yeah right!) I'd be tempted to try the BK17 for the clip point and edge shape. Good thing we are allowed to own as many knives as we can sneak past our wives (they all look the same to her, Just like guns).
Hunting season is coming pretty quick and I just ordered a BK4 this morning, so if I am to take my own advice I better get off the computer and out to the shop and make some more money!...