I did a lot of research on this. In some case the batteries were very different!
Some have Bluetooth, a port for firmware upgrades, some have heaters, some don't have a low temp cut off as in the Power Queen. Some have automatic heaters some don't So you need to decide, what fits your needs.
In my case I live just out side of Boston where the temp can go below 32 degrees. So the battery I went with will Turn on the heater automatically. When it reaches temp, it start charging. Bluetooth is nice, I can see the rate of charge or discharge per battery.
Warranty and tech support is another factor. How easy are they to talk to. Look at Victron, a great product and I have there chargers, but try to call them.
In the #2 post was mentioned marinehowto.com. In their site they mention Kilovault. I bought 4 of them and completed my second season with them. All good and tech support told me what setting in my Magnum charger to change. They seamed very to knowledgeable.