Not a simple question to answer because it more depends on the details of what your ISP is using on the particular cell towers.
From a quick look the huawei run lte bands 1,3,7,8,20 and the ZTE runs 1,3,8,25.
So what happens if the tower you are using need band 7 or 20 or 25. These are not consistent between the adapters. If you do not have the proper band it will drop back and use one of the slower 3g encoding.
This really is a ask someone you know that has one or ask the ISP to let you test each out in their shop to see which works better. The ISP maybe able to tell you which will work better in the area you want to use them.