As with any certification, it really depends on what your goals are. Do you need something more vendor-specific, or are you looking to just show that you work with
J2EE, or perhaps both in the long run?
I'm slowly working my way towards JCert with IBM WebSphere myself. But, in the meantime, I wanted to highlight my ability with J2EE, so I took the SCWCD exam. It gives me something to showcase my knowledge in that area while I'm still preparing for the necessary exams to round out my JCert track.
As my mother would say, another slip of paper hardly ever hurts. (The ugly lapel pin is another story.)
Added: Though, in terms of which is "better"... any certification is worth only what you think it is, and what you can convince a client/employer that it's worth. So to say one is better than the other... is really a matter of asking which coincides more with your eventual goals.
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Theodore Jonathan Casser
SCPJ2 and SCWCD
IBM Certified Specialist - WebSphere Application Server, Std. Ed, V3.5
[This message has been edited by Theodore Casser (edited October 04, 2001).]