This depends entirely on your location and link preference.
If you are far away from a tower, you'd go for a last mile setup like SXT, LHG, LHGG.
If you have very good or adequate reception and don't care for placement of the device, then wAP, LtAP, hAP ac³, Audience and Chateau are better choices,
and most of them support external antenna setup modification so you can take the link a step further for reliability with roof mounted directional antennas or dishes.
MikroTik's mANT LTE 5o antenna for MIMO is also highly recommended and very cheap for what it provides!
Each of those devices have different specs for various types of use. I'd personally go for the lowest end one you need and stick with it.
My view is that all I need is the 4G link so for an LTE Category 6 card, I'd require at least Gigabit connectivity to get full throughput, hence LtAP LTE6 kit is my choice.
It works like a dream. I've setup a few as well for customers and they've never had any issues during failover or any issues in general.
It is more expensive than just getting the LTE6 card and filling up a spare miniPCI-e slot so consider everything!