Your first read is usually the best.  It is a well-know fact in psychology that our first impressions on many things are almost always correct.  Our eyes and brains work very well to help us navigate through various situations in life.  When you read a putt, chances are that your first read is a good one.  You might get a different perspective just to verify it, but do not go back and forth debating the break with yourself or your partner, as this will simply distract you and create doubt.  Get your read, commit to it, and stroke the ball into the hole.  There is no need to make a big production out of figuring the break of a putt.  Be confident and decisive, and you will make more putts.