I would say that the 8600 is a better choice. The krzr's ui is incredibly slow and only has the original vzw ui. The 8600 is much quicker and it has flash themes. Signal strength to me seems to be pretty much the same for them both, and neither of them are spectacular in that regard. The only thing I do not like about the 8600 is that the mp3 player buttons can be easily unlocked, and can start in your pocket if you are not careful. Call quality is pretty good on both phones. Also if you like to text, or dial without looking keep in mind that the 8600s keypad is completely flat with the surface of the phone. The buttons are large and easy to press, with the exception of the soft keys, which I find somewhat difficult to press. I personally really like the krzr's keypad. There are dividers between the buttons which makes it easy to tell them apart, and they are in straight lines, unlike the razr. Good luck
-z