Vodaphone or O2 for new phone?

[coookiies]

vodaphone is great !! believe me, i have 300 messages for people in vodaphone, 300 minutes with people in vodaphone and 150 mesages for people out of voda, and 150 min for people out of it ! its really goood

[Natalie P]

I'm going to buy a new phone for christmas and i was wondering which phone company to go onto, and im stuck between Vodaphone or o2, because i have been recommended that they are quite good.
If theirs any other phone companies that are good could you please add in, and what type of offers they have? Thanks alot