iphone or HTC: which mobile phone shall I buy?

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I want a fancy one that will allow me facebk and google+ access, etc etc
What's the best? Relative advs or disadvs?

Not much mention of them here, but I have the sony ericsson xperia arc, and I love it! Its a fab phone, takes a better picture then my camera does, is really fast and light, and its shiny. What more can you salford? I played around on the galaxy s2, found this much easier, although quite similar, and prettier too!

Sent back the unwanted Nokia N8 (thanks to some stern words on here :)), finally exited contract, and have ordered a lovely new HTC Sensation. Should be delivered tomorrow.

Got it free on a £25 per month T Mobile contract with plenty of free mins/texts/data.

Yay!