Which phone is better the Pantech matrix or Sony Ericsson W580i Walkman?

Pantech Matrix i personally have the sont ericsson walkman great phone but after a few months (9 for me) the keys begin to show signs of cracking Im a big texter most of the time. But if your a big texter, the matrix. Matrix has a few flaws like the screen comes of after a month or so but other than that i think its a better pick. even though i still love my walkman. Most pantech phones last 1 year or so. walkmans you can get repaired or replaced for free if you have att so Matrix if you were me....only reason i got the walkman is because the matrix wasnt out yet!