I don't use IPTV. I have a PC setup to my TV. So I haven't dived into this world.
But I have done some research, and I cant seem to come to a conclusion on this specific issue.
My grandmother doesn't speak Read/Speak English. She speaks Persian. I was going to get her a Persian IPTV subscription.
I can obviously teach her how to navigate and she can remember that. So I wanted to know which is easier to use? She can't be casting off a smartphone or anything crazy.
TL;DR. Firestick 4K or Chromecast with Google TV for simplicity and getting through channels.
Never set your parents up with new or unfamiliar tech unless you want to be doing tech support every day for the rest of your life. I know whereof I speak.