Dunno about being shipped as default, due to mono (no comment), but either way it doesn't really matter. I use Rhythmbox, but also am a fan of Banshee, so I frequent the wiki to check how it's doing. I just tested 1.2:
Banshee's Pros
Better mouse-over tray pop-up (Shows the progress slider), and better Tray Context-Menu (Repeat/Shuffle) Next-Song/Next-Random-Song button (Perhaps not useful, but IMO, this is a very nice touch) and has shuffle by Artist/Song/Album Right-Clicking on the Columns allows for easy change of visible Columns Superior Last-Fm integration (Right-Click tray has Love/Ban Track), and the UI is more intuitive (Indicates when buffering, and fetching first results) Stop playing when finished song Close to Tray (CON: enabled by default) Recommended Artists Search (Artists/Albums/Titles) Equalizer Cover Art fetching/Cover Art from the album folder Bookmarks (Saves your place in the current song: might be good for Audio books, but I disabled it)
Useful Extensions: Mirage! "Mirage analyzes your entire collection. When it's done, you add songs to a special playlist and Mirage automatically fills in songs acoustically similar to the ones you added."
Banshee's Cons
Video playback was rather buggy -- it's a very nice feature, but not one I expect to use. *Tiny* progress slider (With a -crappy- "Seek to position" addition) (Show Stopper, seriously, how can *anyone* use this -- what were they thinking?!) No directory watching (Show Stopper, but allegedly planned for next release, yay) Larger memory footprint (~50 megs vs Rhythmboxes' ~20 megs, whatever, if you're not using it, you're probably wasting it) More CPU Cycles than Rhythmbox (I can handle this, I mean, it's not *that* much more) The furthest-right column isn't flush like the others (Minor inconsistency issue) The UI is cluttered, with many things being grouped in corners (Art, Controls, etc., and free space is wasted (However, from their wiki: "The lower-left cover art and the ability to set cover art are still being worked on.") "Write CD..." is under the Edit Menu, and not "Media" which is odd. (Minor issue) No Crossfading/Gapless playback (Show Stopper)
Rhythmbox's Pros
Near instant load time! Less CPU cycles (Meh. CPU's are fast; but if you need lightweight, I suppose it's essential) Lighter Memory Footprint (Meh. Memory is cheap, but if you need it...) Stability Search (Artists/Albums/Titles) Nicer length of 'seek-to' slider (My favourite feature by far, much more accurate) Nicer side bar groupings (benefits lighter themes ... I use Aurora Midnight, lol) UI has less clutter; it uses available space better (Album Art in Sidebar) Close to Tray (not enabled by default) Crossfading/Gapless playback (with some useful options) Cover Art fetching/Cover Art from the album folder
Useful Plugins, to match Banshee functionality: Equalizer In the Mood (Picks the next song, based on the 'mood' of the currently playing one, essentially, Mirage for Rhythmbox) Music Recommendations from Last.fm -- almost identical to Banshee's, but I like this one better.
Rhythmbox's Cons
Missing: stop playback when the current song ends. (Minor issue, but it would be nice) Doesn't fade-out when quit (Amarok does this, it's nice) No Video playback (As I said, doesn't really bother me.)
Misc.
No matter how much I try to ignore it, Banshee (Or any other player, for that matter) sounds better than Rhythmbox; I don't even think this it possible (It's the same back-end!) but I swear I can hear a difference. Am I just crazy? - No, don't answer that.
That Banshee is a good player is clear, in fact, I think it's excellent. And although I found it harder to configure than Rhythmbox, it's certainly an easy to use player. Yes, it does lack some much needed things, apart from that it's nearly feature complete. But Rhythmbox can be made to have identical functionality. And it doesn't have the same shortcomings. So, why switch to Banshee? What's holding it back? For me, it's the small (but not infinitesimal) UI imperfections and, for others, the bloat (which to be fair, can't really be helped). I'm not sure if this is enough to stop it being the default choice but, for me, I'm back to Rhythmbox. Banshee was so close to being my new, favourite music player; I'm sure there will be a time (seemingly soon; they are pushing new versions all the time) when I can put up with the bloat and sluggishness -- only when the features mature and the UI is polished to a glossy shine. Maybe then, it will be ready -- for me, and for Ubuntu. But as I said, I like them both, and I definitely like where Banshee is headed. Problem is, it's not quite there...