A microphone without an interface is absolutely useless for recording. It literally cannot do anything.

Also, we have a sticky. Read it. /thread
This is not an either/or question.

It's a both.

Unless you want to DI your guitar in which case you don't need a mic.
All I want is for everyone to go to hell...
...It's the last place I was seen before I lost myself

Quote by DisarmGoliath
You can be the deputy llamma of the recordings forum!