Wow thats a tough one! I love slumpbusters, but I have caught literally tons of trout on Wooly Buggers. I might have to give the edge to the Slumpbuster, only bcause of the Body Braid. It gives the fly the shiny translucent eyoneffect that the naturals have. Anyone that knows me knows how much I like contrast in a fly. The shiny under body matched up with the squirrel fur wing and tail are a perfect combination. Also, there are so many combination of fur, body braid, beads and other flashy materials. You can also throw in a collar of hackle instead of the squirrel fur collar.
Let's hear others opinions on this one... I am sure we could build one awesome streamer with some input from others...