I'm going to go with the Catalina based on it's range (very important in patrol) and it's versatility. Check the Black Cats site posted on Page one for some really good reading.
I don't think I've ever seen a photo, but apparently they occasionally made night torpedo drops against Japanese shipping. During the fighting around the Solomons, one Cat made a daylight run and slammed two fish into a Japanese transport. I'll be looking for a pic though.