Best 930F firmware to use?

Just received my 930F purchased off ebay. It appears to have a Afghanistan. Which firmware would be best to replace this with? I used XEF on my S6.

Ideally, a firmware that might be able to support wifi calling/volte on ATT would be preferred.

So, I would like a firmware without any carrier bloat. Any suggestions - BTU, XEF, EE, Orange FR, TMO DE etc?

from xda-developers http://ift.tt/22anGz3
via IFTTT