WESTBROOK, ME - JANUARY 4: IDEXX Laboratories has been added to the Standard & Poor's 500 Index. (Photo by Ben McCanna/Portland Portland Press Herald via Getty Images)Portland Press Herald via Getty ImagesIDEXX Laboratories’ (IDXX) recent jump has investors questioning whether it’s still the best bet—or if a stronger opportunity exists elsewhere. A closer look at its key competitor suggests there may be a clearer winner. IDXX stock rose by 5.3% over the past day. You might feel inclined to purchase addition ...