Shure SM58 vs. Blue Snowball USB

I am preparing to do some more recordings on GB and am wondering if I should stick with the Blue Snowball USB mic (which I used for six recordings here) or get an interface for the Shure SM58 that I use for live performances. Browsing related discussions in this forum hasn't swayed me one way or the other. The lazy part of me says that the increased complexity of the interface will be more trouble than it's worth. Any feedback will be appreciated.