Uh.. depends on how you use it
I reckon the w600i is a better all rounder phone
w600i VS d600
1.3MP camera.... 2MP camera
more colour..... less colour (TFT screens)
bluetooth+infrared...... bluetooth only
heavier....... lighter
more talk time..... less talk time
longer stand by...... shorter stand by
radio...... no radio
omg i cant be screwed no more
But I just like the SE more.. has all the knacks to keep you amused
But whichever phone you choose in the end, you'll always want the one you don't have