Had 12 volt duracells DC 24. Served me OK. lasted 6 years. They were january 2014 matched pairs.Cell went dead on neg side battery I Run 1100 watt inverter and do the coffee maker thing and toaster...
Voltage drop at high amps also relates to the size of the bank in AH. More AH less drop. I don't have exact numbers, but the two 6s at 215AH will do way better than the two 12s at 150AH despite being 6s instead of 12s.
Go for the 6s!
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