I agree with the BC of the 25 grain .22 being better than the 25 grain .25. And also that a Heavy .25 pellet in the 34 grain area has a good (but not better) BC than the 25 grain .22 pellet. Both have a better BC than the 45 grain 30 and approx. the same as the 50 grain 30.
However, what wasn't mentioned is accuracy and reliability. The 25 JSB King is without a doubt one of the most accurate pellets I've ever shot, plus they are also the most consistent. Yes, the BC isn't as good and they'll have more drop at farther distances, but they are damn accurate and damn predictable. Plus out to about 125 yards or so, that ground squirrel won't know the difference between the FPE its hit with when both have energy to spare at that distance...
So no matter what the BC, drop, or speed, if you can't hit the target you can't kill the target...
Accuracy trumps power almost every time.