Samsung Impression SGH-A877

I am about to get a new phone and an AT&T wireless account. I notice that the LG Xenon and the Samsung Impression appear very similar, and in fact, on the AT&T site, compare as identical. The Impression is a little more expensive, but if it is a better phone it would be worth the difference. Does anyone have any feedback on comparing these two phones? I was also looking at the Pantech Matrix, which is not touch screen but has a double slide and is less expensive. Anyone have any info on comparing that to the to touchscreen phones?