That's why I capped MORE OPEN (should have quoted it). I guess I should have said more prevalent.
And, yes, AAC capable players are more prevalent in the market then NON-AAC because iPods have market dominance. But, since iPods also play WMA (don't they?) and most everyone elses players also plays WMA, but many of the other's don't play AAC then logically WMA capable are more prevalent than AAC capable. And for the same reason MP3 capable players are more prevalent than them all.
J in KC asked about an iPod and wanted easy, I think iTunes would be the way to go, but I just wanted to describe the various alternatives.
Now, which is truely more open...use MP3 by most definition of open standards is more open, but that is only because the Fraunheuf (sp?) codec has been pirated so much that it is pretty much in the public domain now. There was a time where an MP3 enc/decoder was something you had to license (I know, I wrote a transcoder library for transcoding MP3 to WMA for Microsoft in 2000).
But, the rights-managed standards are the more dominent ones today, though they need to be licensed for use, and Microsoft is pushing licensing of WMA/WMV, but Apple seems to want to hold AAC close to their vest.
TJR