I had a 3g mifi unit from Verizon that we used a lot at home and while traveling 4 years ago. We upgraded to a 4g service after a few more years and continued to use it. Both worked well and to be honest, I could not tell much difference in the data speeds. 2 years ago, we went to iphones with the hotspot feature so we discontinued the cost of the additional line.
We took the savings and got hs internet service from Xfinity for less money. We use it when at home. On the road we use whatever we can access or the hotspot if we are in a location w/o wifi.