A lot of folks are talking about this after the release of the 37mm Black Bay 54. This video shows you a side to side comparison to help you make up your mind if you are stuck between the two choices. Two great watches and you can't go wrong. If you are shopping between them and have a 6"-7.75" wrist I would probably lean toward the 54. If you already have the 58 I would probably not add the 54 or trade to get it... they are that close. Hope this helps you.