Personally, I think both flows are equally important. Sun's certification focus on the common knowledge of Java, which works on all platforms, IDEs and ASs. However, ICED (or other certs developed by vendors) focus on how the specific product, like WAS and WSAD, work together with Java.
Thus, I recommend you to acquire for both flows.
Nick [ October 07, 2004: Message edited by: Nicholas Cheung ]