I was really surprised to see unleashx at the top for not having an update in a while... well this post is fairly old so I guess that's not an excuse. It does kick ass though and is in first place so far (evox doesnt count cuz thats the dash everyone starts with). I think XBMC is awesome but I dont really call it a dash. I just use it to watch Red vs Blue really. Also on unleashx, you can download game previews, game icons, save game files, skins, and more right from the dash. A lot of skins have support for the game previews and plays them right on your main menu which is an awesome featuer. It also lets you password protect your porno or anything else that might need it too!
I just cant wait for UIX to come out, it looks really awesome and is gonna have a ton of shit. I am looking forward to it almost as much as I was looking forward to Halo 2.... well maybe not, but I am still looking forward to it more than any other dash.
Really, for the most part, each dash is the same and the best one is normally the most newly updated one. I just wish I knew where to get Dash 2gam cuz I aint signing up for no bullshit french website. Oh well, just have to stick with UnleashX. There needs to be more porno skins for it though.