Generally speaking you want to go for the newest category or most inclusive set of categories possible if you intend on using the device for as long as possible. For the BR1 Mini, I would get the newest device that has CAT7 support. This includes support for Band 71 with T-Mobile which is important for longer distance connections, like on a boat. The cheaper ones with slightly older bands are only $50-100 cheaper - not really worth that if they are that far behind tech wise.