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Basically the router needs to have a minimum of 2CA (2 carrier aggregation) to be LTE-A. The B618 can do carrier aggregation but does not support carrier aggregation between band 3 and band 38 so even if you get the B618 you will never see LTE-A on Rain EVER unless they open their network again to all devices.
Which device do they issue?
The biggest difference from the user's perspective is that you'll be able to get up to 60Mbps with the 618 vs the 30Mbps with the 315. This might be a mute point if you are in an area that is over-subscribed, but luckily in my area I get the 60Mbps on the Rain network.