Neither are perfect. I have used both and have both on my iPhone. I get TripIt free through my AMEX Platinum card and already had Worldmate Gold. TripIt is better at trip management and I like the feature to automatically add items. Worldmate has better tools for searching for flights and little things like a currency converter. I'm letting TripIt manage all of my travel right now but if I had to pick just one I'd probably go with Worldmate due to the extra features. I think both of them are quite good though.