However....
Yes, the 58 is THE famous Shure vocal mike for live applications, and the 57 is THE famous do-it-all, Swiss army knife of mics that has long been considered by many to be the standard guitar cabinet mic. It's also the old standard for many as a snare, hi-hat, tom, and conga mic (although I tend to think of the 421 as more the current standard tom mic, but I digress...). However, some prefer the 57 over the 58 as a vocal mic, especially for recording. Some will say they can't hear any difference between the two. They are essentially the same mic, except for the ball windsceen on the 58. It depends, as everything does, on YOUR voice and YOUR taste. The 58 is about $100, the 57 roughly $80. They are both built like tanks, extremely durable. I personally think you can't go wrong getting at least one 57. There will always be something that you can use it for.
More than you asked, I know.