There are no downsides to using living rubber. The thing is living rubber is limited to only a few different colors. Silicone is made in any color imaginable. I am an avid jig fisherman and fish jigs year round and when I feel I can get away with it I prefer living rubber because I feel it looks more life like and almost breathing/pulsating on it's own. Is it big enough to make a difference to a bass? Who knows but I catch just as many on silicone. I suggest fishing colors you are confident in and if that happens to be living rubber then so be it.