Should i go with Telstra or Vodafone?

I'm looking to get a iPhone on a contract and want to know which service people prefer and if they have ever had any problems with telstra or vodafone

I'm currently with Vodafone and to be honest the service is not the best… In fact I can't wait to go back to Telstra when my plan ends. I would go with Telstra for the better service and reception.