Range = amp hours, 6 8V simply has more I have two carts one of each, the 8x6 goes more miles.
I think you just got an opinion from a service tech that doesn't fully understand.
Having said that an argument can be made that less batteries & cables mean less weight.
Less weight = more range......to a point.
But I vote for 6x8, with my solar addition I can approach 80 miles +-
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