[samarudge]

I'd say the right, it looks nicer and fits the style of the other elements better.

Also remember, the styling of the left dropdown is based on what Mac OS/X shows a dropdown to be, if you look at it on Windows/Gnome/KDE etc. it will most likely look different (Unless the images of the Mac default select are hard coded in, which would be a lot of extra effort, if you were going to do that you might as well do a custom dropdown)

Post; If you're interested in doing something like the right hand one on your own site check out https://github.com/harvesthq/chosen