I always use a condenser mic for vocals when possible .. but the original question was SM57 or SM58 (?)

We could debate all day on price/value of condensers, but again I defer to the original question .. 57 or 58(?)

I basically agree; a $99 condenser is often better for vocals than either a 57 or 58.

However, a condenser mic also requires learning proper technique; they pick up everything!
I had one singer tell me "Holy crap; I can hear myself scratching my leg"
My reply
"Uh, yeah .. so do I"

/along with better sound comes better technique to begin with

Make your sound your own!
.. I do not work here, but the benefits are still awesome