I have a question: how durable are cubesmith tiles/stickers? I just got a Dayan linhui, and after 5 days of hard use the stickers are already peeling, and I'm looking to buy some new ones. So which, tiles or stickers?

Cubesmith stickers tend to last for an exceptional amount of time. It takes them a while until they start to show wear and tear, but tiles are extremely durable and will never peel. If I were you, I'd go with the tiles mainly because they are more durable, but if you want a shinier puzzle, I'd go with the stickers.

Do you know if they would fit a Dayan?

Also, do tiles hinder the puzzle at all?

I looked it up, and in the cubesmith updates topic, it said that the tiles don't fit the dayan cubes. But it also said that they really just need to be more rounded. You might be better off asking someone who actually owns a dayan cube or you could trust me

EDIT: I forgot to answer the second part of your question: I don't think they really hinder the puzzle. They actually give you a better grip on the puzzle(In my opinion).

What about stickers? Do they fit Dayan?
Also, if the normal tiles are too big, you could just use the smaller ones, I beloved.

I forgot about the small stickers. The small 3x3 stickers fit the dayan cubes. I'm not sure about the small 3x3 tiles though, but I think they might.

Easy thing.
Both normal size tiles and normal size stickers are fine for Dayan 3x3s (exept Lingyun).
However they might slightly peal at these inner "holes" between the pieces, but only if you speedsolve it a lot.
I recommend to get two sets of half bright stickers. That is still cheaper, but nicer and lighter than tiles. And if they start pealing somewhen just replace the bad stickers.