Two 3EH 6 volt batteries in series = 925 CCA and 350 RC.
Two 3ET 12 volt batteries in parallel = 1000 CCA and 240 RC
That of course can vary a bit with different brands. They are basically the same.
The two sixes give a longer cranking time.
The two twelves give less cranking time but a little more amps at first start. Probably a 1/4 volt higher at first cranking.
If it were me, I'd rather have the extra reserve capacity of the two sixes.
The CCA at 12 volts is a figure that shows how many amps a battery can supply at zero degrees for 30 seconds before it drops to 7.2 volts. The reality is - your starter is designed to crank at 9 volts and once voltage drops to 8, it won't do much.
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