Internet on the road is just downright expensive. And as you've no doubt discovered by now, most campground Wifi just flat out sucks. It exists, but don't expect to do anything fast, or to be able to stream video. I think in my 4 years of full-time travels, I've come upon 3 or 4 places with really good WiFi.
I have no experience with Viasat or Hughes, but have done some research. The biggest thing you'll find right off the top is... just like your cell plan, these companies charge you by how much data you wanna "buy" each month... and it's OUTRAGEOUSLY expensive.
Met a guy at my resort in Arizona last winter who had 2 satellite dishes on the top of his rig. One was a nice Winegard like mine for DirecTV... and the other one looked similar, but since it was pointing almost 90-degrees off, I knew it wasn't a 2nd satellite TV service. Went and talked with him, and sure enough, it was an auto-tracking antenna for satellite internet service. He travels for business, and requires it.
Long story short... the dish cost about $2,500, and he pays about $1,000/month for service. Of course, he writes it all off as business expense... but that's too rich for my blood.
I did get a website address for some info about the various dishes & services out there though. It's https://www.mobilsat.com/Mobile-satellite-internet/
What I've been using is mostly cellular data. I have AT&T service, and an unlimited data plan for a few devices (iPhone and 2 iPads). After 22GB of service, I do get throttled a bit (slower download speeds)... but it's still acceptable. For app updates, and high-data downloads, I usually just try to do those on the campground WiFi during the middle of the night when no-one else is online. When I wake up in the morning, they're usually done.
WiFi on the road has definitely been one of the biggest challenges I've found to fulltiming. As a society we've all adapted our lives to need it... and as an industry, the camping & RV world has adopted it. It's rare that one can even find campground info in a book anymore. Yet WiFi is still rarely available at most facilities, especially so in the west.