myTouch 4G Slide 800 x 400 pixel 3.7 Inches Super LCD Capacitive Touch Display Sensation 960 x 540 pixel 4.3 Inches Super LCD Capacitive Touch Display http://tmobilemytouch3g.blogspot.com/2011/08/mytouch-4g-slide-vs-htc-sensation.html
I have an EVO4G on Sprint and love it. My friend has the HTC Sensation with TMobile and he loves it, aside from HTC Sense. He is going to root it and load an AOSP rom soon. My mom and bro have the Samsung Galaxy phone ... don't get Samsung. Cheap feeling phones with an OS that will never upgrade. Samsung tends to fall behind the schedule with their OS updates.
Good to see you've chosen to go with the Sensation, remember to keep that charger handy cause HTC Sense loves your battery, like a the most devoted spouse your battery will ever get Okay I was exaggerating, I prefer Sense 3.0 myself.