CD vs FLAC stored on flash drive vs streaming

I've used Taiyo Yuden CD-Rs

They were all I ever used, but you have to watch out, because many being sold are fakes, then found other ones just as good.

Now I don't bother with copying just get the original retail uncompressed versions if any, and used if need be, as to me they are better.

If you with flash drives include hard drives my guess is that they sound the best. Less risk for error correction and timing problems. SSDs are really fast and proven to work. 

Drawback of SSD is limited number of write cycles. They increased it greatly, but at the same time introduced new architectures, like "quad cell" - where writing to one cell causes writing to four. It is not a big problem (nothing lasts forever) and no problem for music storage. It is perfect application for SSD (constant reading, very little writing).