It depends on the amperage rating of the new battery (More amps. = more charging time)
The advantege is related to the same issue, more amperage, more punch and it will last longer.

I would ask you, how many times do you use the starter in the field?
If you have some engines harder to start, then it will be a good choice, but if your engines start easily and you fly 4 or 5 times a day, then IMHO there is no need to go with a larger a bigger battery.