I don't like screw downs because any thing that gets inside the holder or sleeve is being compressed against the card, unless it's loose. I use a penny sleeve, top loaders, and game bag for cards that I want to stay secure, dust free, and keep from being under too much compression. I'm no expert though, so I'm sure people will argue my opinion.
For the really expensive cards, I use the newer screwdowns that come with recessed corners and sit a little loose. Offers the same level of protection as a PSA holder if not better.
Comments
stories of the card's surface getting stuck to the holder.
BTW: Cubby=Cub Fan