it depends what you use it for but iphone is by far the most restrictive platform. Only apps that pass apple's policies can be installed on an iphone. Why dont you get a Android, it has very few restrictions on the kind of apps allowed in the market, and if an app is rejected for some reason (adult content) you can always easily download and install the application via the author's web site, or a number of other "markets". Apple restricts their OS and does not allow this.
Android is far FAR more customizable than the iphone, and can run types of applications that apple would never allow in their store.
