Antenna for Spitz AX (GL-X3000)

I am trying to pair an external camper roof mounted antenna with my Spitz AX (GL-X3000). The camper is an aluminum sided 25ft camper with a regular EPDM rubber roof. I have narrowed my choices to the Poynting 3-17 or 4-17. The primary usage would be in remote locations or campgrounds with weaker signals, not necessarily urban areas(US). I primarily have sims setup with ATT and Verizon. The 3-17 uses 410 MHz to 3800 MHz bands and the 4-17 has Ultra-wideband coverage from 617 to 6000 MHz. I have no idea what this difference means in regards to what I want out of the pairing. Anyone have any recommendations one way or another or even a different brand?

I am going to assume the 4-17 has MIMO X 4 which is what you want for this router.It also covers all the US bands which the 3-17 doesn't per the specs.
I am in the same boat, but with a fiberglass sided rig.
I am going to try the included antennas as some of our favorite "out of the way" sites first and add external if necessary.
I am trying to decide if I want the omni-directional or to go with a directional for max gain, but attach to my mast with wingnuts to allow easy aiming if needed....

Both have mimo x4 plus 2 wifi and one gps which I won't use.

My wife used a Peplink Mobility 42G antenna all winter in south Texas. Wired into a T-mobile home internet gateway inside the trailer. It is omni directional. I mounted it on the same extendable pole as a weboost antenna. Hardwired thru an Icotek cable entry port on the side of the trailer. With the extendable pole, you can twist to any orientation without loosening wingnuts.