is there a better brand of SD type flash memory, or is it all the same?

Question

specifically, micro SD for cellphones. Also, can any other type of music file be used, or just wma files?

Answer 1

I think it is all the same as long as you go for a proper brand, instead of johnnie no-make. I say that because if you get problems, a proper brand offers more chances of recompense.

Not sure about the music format question. Either check the manual that came with your phone, or just try it. If a format doesn't work, you can just delete the file. It won't hurt the phone or the memory card.