I had a Pre for as long as Verizon had them before I got my X. I loved the OS in the Pre but it was just slow.
One thing I have discovered the Pre did easily was changing which email account I replied to an email with. My work email account will not allow me to answer work emails from my phone(Pre or X). So when I saw an email I needed to respond to using the phone I was one tap away from changing the "reply with" to my Google email. I don't see any way of doing this with the X.