@donaldo, I would recommend you to dive a little on the forum. I’ve done that and you can find several post talking about this topic, some of them quite recent.
I recommend buying a range of products and sampling as many methods as is financially feasible to you.
As posted across 2 recent threads now, there are various methods to choose from. The best method is always one that fits your preference. What seems best for one person isn’t necessarily true for everyone else.
I enjoy the convenience and ease of display that binders provide, especially for cards I’m not going to have graded. There are many problems with 3-ring binders with sleeve pages (ring dents, difficulty flipping pages) but you can get dedicated TCG binders (I recommend Ultra Pro pro-binders) for fairly cheap which will protect your cards well. I usually sleeve my cards with a TCG deck sleeve (stiffer than a normal penny) and put them in those binders. I’ve never had any problems with warping, but I think that would be more influenced by your environmental conditions (humidity, temperature) than what you place the cards in.
They just require extra care and attention. I don’t trust them and one little slip by the handler and boom, damaged forever. This happened years ago to me when I dropped a Sailor Moon non ring binder and several cards got bent. That’s just one example. There’s many.
It’s not as much the type of binder as it is the awkwardness, flimsiness, design if it has rings, etc.
Cardsavers can be thrown off buildings and the cards will be just fine. Try that with a binder or even a top loader…not that you would lol.
The thing I like most about cardsavers is, you don’t have to worry or be careful with them. You can frisbee them or shuffle them and then immediately stick them in an envelope and they’ll be safe all the way to PSA;) All of those things without ever touching the card again.