I similarly eschewed an iAnything until I decided to go EFB vs. paper, and ForeFlight was demo'd to me by a user at OSH one year--I was incredibly impressed. So I got an early Mini, which I still have as a backup to my current Mini 4. Both have cell capability, but I have only a plan for the Mini 4--$10/month through Verizon. I'm already spending just short of $200/month to Verizon anyway, for the family plan and the recent upgraded phone for the SO, so that $10 doesn't seem like much. I have a Brydge keyboard to go with it, so it's effectively a laptop when I'm traveling.
I also switched to an iPhone, because I had a top of the line series of Samsung Androids, which all gave me fits. I'm now on my second iPhone, and that was more because I wanted one with larger capacity than the first one I bought--and they've both been 100% reliable.
FWIW, I tried hotspotting my iPad to my iPhone, and while I can do it, it's really cumbersome. It's worth the extra $10 to be able to just turn the iPad on, make sure its cell service is turned on, and use it. Some say they can always tie to a WiFi somewhere, but I haven't found that very helpful, either--and public WiFi's are notoriously non-secure, whereas cell service is very secure.
So my recommendation is to get a cell equipped iPad of whatever model you decide on. If you don't hook it to a cell plan, you still have a pretty OK GPS to run the EFB's moving map. Incidentally, I've had 2 separate occasions in which my Stratus 2, which has a GPS, had run down because it hadn't automatically shut off like it's supposed to. That meant it wasn't feeding anything, including the GPS, to my iPad. But the iPad still worked flawlessly until the Stratus 2 charged enough to come on line, where it took over providing all of its information to my iPad.
Cary