Never really watched any of these videos, but believe me not all cards are created equal and I'm not surprised if there's a market for this information.
There are two general categories - 100% plastic, and paper. Protip: if the pack says "plastic coated" then they're still paper, and not every pack that says "casino quality" on the outside would actually measure up to being used in a real casino.
Paper cards will fray at the edges with repeated use and shuffling - as a result, if you do a casino riffle shuffle, most paper decks will become unshufflable in just a couple of hours. They also get creased and marked very easily, so marked cards quickly become a problem if poker is the game you're playing.
100% plastic cards tend to suffer a lot less from these issues. They're much easier to shuffle properly, they last longer and because they don't tend to warp as badly they pitch a lot more accurately. That's not to say all 100% plastic decks are good though.
I deal poker for a job, so this stuff matters to me and I've got strong opinions on what does and doesn't make for a good deck of cards. If all you're doing is playing a home game where you overhand shuffle and place the cards in front of people though, it's probably not a big deal.