[.:4:.]

I think the deciding factors are mobile reception, data requirements and cost of 2 plans over say 1.
I personally just tether my phone to my pc. Yes im on a reasonably large data plan on my phone, but also live in an area with good 5g reception. So internet speeds over the 5g are good and i get away with a 200gb data alowance no problem. I have never run past the 200, even if i do it will slow the speed not charge extra.