Iphone 3gs vs Sony Xperia U?

I just wanted a bit advice, i currently have an iphone 3gs, but i've come across the sony xperia u online (and my friends got it so i know how it works), and i love it, i like it how its so girly and i love the lighting, it looks perfect, but people say i'm downgrading instead of upgrading as i have the old iphone 3gs, is this true? Or doesn't it really matter. I'm just abit worried i will miss what's on my iphone as i've never had an adroid so it would take getting used to.

I don't think you r downgrading in any way.had that been an iphone 4s or even iphone 4 then maybe but not with 3gs. And about the OS experience -android has 10 x more features than iOS, so i don't think you'll miss any features rather u'll get to know even more features. Also there's not much learning curve if you've used a smartphone before.
xperia you is superior to iphone 3gs in every possible way - be it camera, audio quality, processor etc.
Plus as you said it has that transparent strip at bottom which glows in five diffrent colours depending upon the colour theme on your phone.u also get a replacable bottom strip of various colours with which you can personalise your device even more and the price is quite cheap too.
Keep in mind though that xperia u has 8 gb of storage of which about 6gb available free for the user and it does not support an Sd Card. So if 8 gb is enough for then you should definitely go for it.

I actually disagree with your friends! I think Xperia you is way better than the old 3gs. It has better camera with HD video recorder, better processor, and I've always liked Android's operating system more than Iphone's OS.

Hope i helped. In the end it's your decision