After using the MyTouch for a few months, I went in and got the Motorola Cliq XT this morning. I fell in love right away with how much faster it runs despite running Android 1.5, although this phone is supposed to get the 2.1 update while the MyTouch likely will not.
The Cliq XT is perfect if you're big on social networking and the convenience of having the widgets right there on your homescreen (with 5 different pages as opposed to MyTouch's 3), it's much faster and easier getting in touch with others and seeing what's going on with the world. The second you start up the phone it prompts you to fill in your information to synch your e-mail account and social networking site account with the phone, and you immediately receive alerts once you're finished. With the MyTouch, all I received were e-mails with Facebook notifications, and if I wanted to see what was going on on Twitter, I had to manually open up the app and wait for the news feed to load.
While I love both phones, the Cliq XT won me over for it's easier use and faster performance. I'm really excited for 2.1 to come out on this!