Lets see I have RES,CNBG,LMB, and HSB in my pond.
Most favorite? Hmm that's hard. I love 10 inch BG they are fun!! I found pondboss before I ever stocked my pond so I really don't have any regrets as far as fish put in my pond.
If I did though I would guess it would be the CC. For the same reason esshup gave above. A 20+ pound cat will pretty much try to eat whatever it wants... I don't need that in my pond.
RC