Need some guidance here

So, a very kind person helped set me up with Usenet and while I understand some of it, some of it goes above my head. This person, set me up with buying TB blocks. So far, it has worked well. I try and buy them for $10USD when they go on sale but I missed the last one and I'm running out. They're $45usd regular!

My wife and I watch a lot of weekly recurring shows so it adds up quick. Between that and movies I probably go through a couple TB/year.

They have some unlimited plans though but I'm not familiar with some of the "perks".

Here's what I'm looking at

Any insight would be great.

Thanks!