Somebody sent me a DaneElec some years ago which would not accept digital audio, so care is needed if audio is a priority since some cheaper brands do not fully comply with the sd specification.
However cheap brands buy in their controller and memory chips and just package them and supply varies from batch to batch so performance one year may well be different in another. Dane could be ok for audio now, I haven't tested any lately. Fuji and Duracell also just buy in any bits they can find. For only technics/midi saves it doesn't matter for 95% of brands.
SanDisk are safe because they are one of the few who make their own controllers.