Title says it all. Switch stickers seem to be more expensive but I can't find really find a difference. If anyone knows the difference, or which ones are better, I'd love to hear it!
Mmm, dunno about the pricing as I didn't check before writing this but well, the main difference is their application. And maybe colour options? Stickers "stick" so they can be a bit more tricky to apply on the switch housing and I think they're also a bit more flexible so that also makes it a bit harder to apply.
Films in terms are more robust, don't bend as much when you try to apply them and don't stick so if there's some misalignment issues then you can easily try again.
I personally have only tried switch films and it was a quick and painless experience so if you really looking for which type to get - go with films.
Also keep in mind that not all switch housings really need them, usually it's just Cherry housings that get a bit more wobbly when you open them up. It adds a tiny bit of change to the switch and in the end it's more of a style thing and not absolutely necessary.