Marshall 1960 cabs have swtiching between mono and sterio

But which one?, How does it split the sound, as there is only one guitar sound

Is there much difference

i'm about to get custom cab at avatar speakers, in which it is either mono or sterio, but no swtiching..

Don't know which one to choose. I'm going to be doing some recording. play rock/metal

any ideas apprecited.
You'll only need the stereo function if you are using two amps and once or using a stereo power amp or modeling head.
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for the 1960 cab stereo just means that the left and right speakers are seperated so you can do things like run a stereo delay, use two amps, or run a wet/dry effects signal etc.