I like them all and am glad that we have choices.
I've not yet delved into vinyl but it defintely has a lure. Can't beat the sound quality in a good system and a good, clean pressing. It still seems like a big headache to me though. Maybe one day.
I've not bothered with MP3 either, although the convenience is amazing so I'll never say never.
I've not done much with DVD-A either, and although I like the ones that I do have, I don't yet have a high quality universal player that will show me what DVD-A is all about. This will happen soon by accident to meet my DVD-V needs for HT purposes (I'm eying the Denon 5910). So I'm sure the DVD-A's will start piling up.
SACD is my favorite medium in the sense that it combines the SQ and ease of use factors, but tends to be quite expensive. I've got a zillion of them, so if I'm a fan of anything it would be SACD.
I've also got a lot of XRCD's but the selection is very thin, and they are also pricey.
Redbook CD's are fine for backfilling your collection with music that you love for the sake of the music itself (which represents the bulk of my collection). But unless something has been WELL remastered, I've been passing on a lot of standard redbook releases of late. At some point you have access to so much well recorded music, why bother with the blah blah?