JD, good question, here's an old retired n rusty electrical engineers answer.
The CORRECT answer is it depends, IF you want the most cold cranking amps for starting purposes the best is what combination yields the most CCA regardless if its two sixes in series or two 12's in parallel. The two sixes in series yields 12 volts HOWEVER the CCA's ARE NOT ADDITIVE. To the contrary two 12's in parallel is still 12 volts HOWEVER the CCA's are additive.
It may well be possible a certain 6 volt has more CCA then a certain 12, but even with two in series if batteries are identical you only have the CCA of one of them.
REALITY a 6 volt is less common and maybe more expensive battery you might find available off the shelf while a 12 is much more common and readily available.
IMPORTANT NOTE I haven't seen touched on below and many lay persons are unaware !!!!!!!!!!!!!!!!!!! In the event you choose two 12's in parallel (likely my choice and decent chance more CCA's) in order to achieve better load and charging balance among the two be sure to run the big main heavy POSITIVE cable off Battery A and the big main heavy NEGATIVE cable off the other Battery B. IE don't run both big heavy main cables off one battery.
John T Long retired Electrical Engineer but believe the above still rings true
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