Which type of fish will survive better in a pond?

Smallmouth b or rainbow/brown trout? I have a small streamfed pond in which the water rarely exeeds 65 degrees. It was previously stocked with rainbow trout, which did moderatly well. It is full of weeds and plants for cover, also has fathead minnows, smaller minnows, and little salamanders. Ppossible redators would be king fishers, catfish(MAYBE) and otters (probably not). I am of course interested in size of fish and catchability, but survival is most important to me.