Well the Rode is a condenser mic, I've never heard one but it would be more sensitive but you need phantom power to use it (although I am sure is is not a problem) according to this review you can't go too wrong with it http://www.soundonso...cles/rodem3.htm
I've been using Sm58's and 57's for years they are very solid mics, I would recommend the 58 more than the 57 if ever you want to do vocals (due to the pop filter) let's just say it's industry standard for a reason.
My two cents are that i think it would be worth trying out the Rodes, hell im even a little bit tempted.
Hope I helped!
Thanks! By the way my decision was based on this comparison, It seems like SM57 is really far behind.
Note that the order is as mentioned below
"Samples are played in the following order:
Apex 435 ($75, large diaphragm condenser);
Rode M3 ($175, small diaphragm shotgun condenser);
Shure SM57 ($100, dynamic)"