Getting a new phone, which one is better Samsung Captivate or Sony Ericsson Xperua?

I am looking for something with easy texting and easy access to the web, fast browsing and something I can take lots of picture and video with. Staying within the capability of phones, if I want to record more I'll just get a video camera. I don't know a lot about these two phones so was wondering if you could help me out. What are the battery life's on these phones and do they lag? Any information helps thanks!
 
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