Not that it affects the sound, or at least I wouldn't think so, but obviously some are better than others in terms of reliability and maybe even access speed.
I've been making do with swapping out a couple of 8 GB Sandisk cards for a while. Have a 32 GB Samsung that holds a lot of music but had some issues with corruption and having to re-format and reload music was a 6-hour proposition.
Is sticking with Sandisk by far the best option or are there other, cheaper things out there that have worked for anyone. Ideally I'd like a 64 GB but for budgetary reasons I'm resigned to a 32 GB unless a good deal pops up.