Hi jlscjs,
The "best" battery for you is dependent on your camping style.
The nee plus utra is 6 two volt cells in series. They are also the cheapest, as with reasonable care they can last 20 years. However, most folks would not keep an RV that long--and it would cost a bit to modify the dinky battery box to accept them. You will have sticker shock at the initial price.
If a heavy duty inverter (1500 watts and up) is going to be used for more than 4 or 5 minutes, then 3 group 31 12 volt jars may offer the best service. The batteries do need to be wired in a balanced manner.
If you never boondock, any 12 volt trolling battery will fill the bill.
If you boondock lots, then maximize the number of amp-hours of storage and use what ever voltage allows that to happen given the physical space and weight capacity of the battery compartment.
jlscjs wrote:
In a nut shell who has the best rv battery on the market? I need to replace mine but not wanting to spend a fortune on gel batteries.