CSS3 buttons or image buttons?

So I'm working on a mobile web app and I'm trying to decide which to use for button styles I have. The buttons involve: - gradients - rounded corners - shadow Here is a sample of both of them. http://jsfiddle.net/G26rr/embedded/result/ Mind letting me know how it looks on your mobile device? Here is what I thought of so far for each.. CSS3 Buttons Pros - better load time on mobile users Cons - the rounded corners appear jagged on Android CSS/Image Buttons Pros - final product looks much nicer on my Android device Cons - slower load times Any input? What do you guys use on your projects?