The SM-58 is everywhere because it is reliable and good quality for the dollar. If you can find the opportunity to work with a good sound man or woman with lots of vocal mikes try out a number of them where the other variables are eliminated (same hall, same stage, same settings on the sound board, etc.) A good sound engineer will set the board to reproduce your voice as naturally as possible: then try the mikes to see what you like. There are performers who carry their own mikes that are usually expensive. If it is just one for you then get what suits you. And if you spend big bucks do not buy until you can make the comparison.