All format, except lossy low-rate mp3 downloads, and low quality CDr (unprinted disc, no artwork, etc.:.)... for physical ones, tapes and CDs are the best. Vinyl for me is too, eh, fastidious? Even if they are looking, and sounding good, I didn't started to collect them for this reason. Tapes are better for an analogue carrier, but it's just an opinion.. but I've think if someones want an exact content, or sound, the format doesn't really matter. I mean, if your selected artist would release a tape/CDr/digital download etc:. anything, what you would not purchase in normal case, would you reject it, even if everything looks good about it? I doubt it, you just want to hear/read/own that kind of content... but I must say, the best to have multiple formats for each releases, so everybody can pick it's liked one.