Well, I don't see an actual poll with options, so I'll write it here, lol. My choice when space is a concern is MP3, with a decent VBR. However, with some music, I need better, especially with classical. For those occasions I go to FLAC...though neither will be allowed within 50 feet of my home stereo where those "obsolete" records reign supreme Edit: Oh NOW you put the actual poll up after I'm done writing, lol.
You can't see the poll? Wait, let me fix that... EDIT: It looks like I can't edit it anymore. Anyway, how come I can see it?
MP3, mainly because there's so much more available in that format (plus just about any media player can handle it).
There have been many new format including the lossless high quality wavpack but my favorite till today remains LAME mp3 even though I use Ubuntu which by default prefers the Ogg format. MP3 is universal and plays easily anywhere, everywhere.
MP3s, ripped via Audiograbber (using LAME 3.98.2) at a target VBR of 245 kbps. Classical music at a CBR of 320 kbps.
I'm not that sensitive when it comes to sound. I hear well, but I don't have that musical touch, so it really matters little to me what format, compression and whatnot. I usually play mp3, as it seems to be supported most widely by players, including my car, ogg and whatever comes on bought CDs. Mrk
Most of my music is encoded in AAC (256kbps)/Apple Lossless (Classical). Some are still in MP3, but I'm gradually converting all of them.
MP3, simply because of the greater availability of MP3 music files. But I consider sound quality a very important aspect as well. On my personal music collection, I maintain only MP3 files of very good sound quality. If there was an alternative with even better quality and similar availability, I would abandon MP3 in favor of it.