A serious combination of Solar and battery reserve will outdo battery banks hands down.
Here’s my experience with this.
2x 6v will have slightly thicker plates so may well work a bit better at deep discharge.
However for a long term tourer (offroad) redundancy is king... if a 6v dies that’s it you’re done.
If a 12v dies in a parallel you can just drop it out of the system.
Other than that it all comes down to packaging.
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