The only difference is that the blue snowball (not the ice) has three settings. There is a front only setting (which is what you'll want). Setting two picks up all the sound in a room which would be good for recording a meeting or something like that. The difference between setting two and three is that setting three has a large volume drop as it was intended to record music. Get whichever is cheaper but it's worth knowing that some ice models are just regular models that don't have other working settings.
Hope this helps.