When I want file folders - particularly the 3-tab style - I head for Manila. I like 'em because the color is consistent and matches most of the others in my home office file cabinet. These are durable sturdy and they are easy to write on. I use a felt-tip marker and they have never faded. No ragged edges easy to hold - not slippery like those plastic ones!.
I love these because of a perfect weight. The last ones I bought were way too thick and they take up too much room. When is filing client charts? Space is a definite consideration and I don’t need to waste it with overly thick file holders.