use of 4S or 5S vs using 6S

[jahno30]

Hello all, im new to this electric thing, and have been reading trying to decide which way to go to convert my Mugen mbx5 over to electric.

I think i'm set on the new CC mamba monster 1/8 combo, but trying to figure out which batts to get and why is confusing me.

I see some run 2 x2S packs and others 1x4s pack and others still a 1x5s pack.

what are the pro's -cons of using dual packs over single.

If more voltage is the way to go, why are drivers not using 2x 3S packs or 1x 6S pack with less mah in there 1/8 buggies?