WOW, I love all the calls in my collection. I can honestly say that I feel there's not a bad one in the bunch.
BUT, if I had to pick only 2 & a "cheater"...
#1: my homemade cowhorn version of TT's Feline Frenzy, w/my "tweaked" reed.
#2: my Osage ArkyYoter "Screamin' Demon"
...and the "cheater"...
#3: The Original Coyote Reaper buffalo horn howler made by R&R Calls/HuntnCarve