I would suggest a DI feed plus a room mic, meaning a couple of feet back from the cab.
The reason for this is that the DI feed will be the cleanest signal and can easily be reamped and toyed with.
The room mic is because it will pick up what you hear while playing. That is "your sound" after all isn't it? Additionally, the room mic will give you the "air" and "life" that will be missing from the DI track. Mixing the Di and mic'd tracks can get you a great bass tone.
Generally I would say go with a single room mic to catch the full blend of your sound as you hear it, plus it's easier to set up than trying to balance 3 different mics and dealing with phase issues. A good engineer CAN set up three mics to capture the different freqs coming out of your cab, however this can be a time consuming/trial and error task.
I hope this helps in some way.
Oh and do not settle for "we'll fix it in the mix". That's a trap. A mix will only be as good as the source material your mixing. So make sure to put in the effort to capture a great performance.
Carvin Club #167
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