What is the best network for iPhone in the UK?

I'm currently with o2 on a iPhone 4S. But i'm upgrading soon, so i wanted to know if i should stay with o2 since i have found a good deal on the new iPhone 5S with them. But i was thinking of asking you guys what network you are on and if it's any good or not? I heard EE is good but very expensive. I need a network with a good data reception mainly since i'm out a lot.

Get virgin VIP they do a sim that is £15 a month and you get unlimited calls texts and minutes not sure if they have 4g though

Vodafone has always worked for me, including worldwide coverage.

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