In my excitement of seeing NICNT titles come up on sale, I took the opportunity to purchase a few books to add to my collection. In my haste I purchased the Leon Morris 1995 edition of the Gospel of John and the J Ramsey Michaels 2010 edition of the Gospel of John. Should I keep both? Has the scholarship advanced enough that the later edition supersedes the 1995 edition or do the commentaries of two well known scholars compliment each other? I appreciate your thoughts.