Do you like PDA or smartphones? TouchScreen or Keypad?

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Hi! I just want to ask you guys if you like pda or smartphones. Or if you have tried one already with the touchscreen or keypad. Is it convenient and easy to use? I am planning to have one maybe Samsung Omnia aside from Iphone, X1, or HTC. But I am still undecided since many said it is hard to use the touchscreen for keyboard and the touchscreen is not durable enough. is it true?