Is the Sony Xperia U better than Lumia 800?

Music: Xperia U is better especially that Nokia 800 sound is disturbed when attached to headphone.

Camera : Nokia Lumia has 8MP vs 5MP 

Internet : Sony U since it support the Flash player. ( I recommend you to download the Delphine Internet browser for faster web. 

Look & Feel : Sony Xperia U is very Unique in style and easier to hold.

Apps:  Nokia 800 has better quality application in general ,but Sony U has much more apps in Google Play Market .

Got it : No I didn't buy any of them,but I have seen the Xperia U .

Although I think that Lumia 800 is better in general it is probably isn't better for you own demands.

Buy a newer Sony phone that does not have an outdated version of android, try to buy a phone with android ICS 4.0.4 or 4.1 jelly bean

http://geekaphone.com/compare/Sony-Xperia-U-vs-Nokia-Lumia-800.

Try checkin out the comparison. But your questions are much of personal preference imho.

Since RAM, ROM, CPU speed of NL800 has an edge between the two, NL800 gets my vote.

lumia 800 is way better