1 pointIf you are looking for Dualband (both 2.4GHz and 5GHz) ones, with great reception and don't care about lengthy antenna, go for THIS.. If you want Dualband one, but not with protruding antenna, go for THIS... Even though going for dualband ones will be future proof, it is NOT really needed now. So for an ordinary 2.4GHz (JioFi uses 2.4GHz only) go for THIS..
1 pointI don't think the battery drain in DualVoLTE networks will be higher than 4G + 3G phones, unless otherwise the 4G coverage of one of the network su(ks... Constant switching from 4G to 3G/2G for voice calls will drain the battery more, imho...