MCAD is a I believe 3
test certification. You would have a a choice from XML WebServices, Windows Applications and ASP.NET web app development in either C# or VB.NET.
Then you would need 1 elective either SQL Server or Security.
The SCJP is just the beginning of SUN's Certs. I would say to compare apples to apples you would need to obtain the SCJP,
SCJD, and maybe SCWCD or SCDJWS.
Then you would be comparing the two correctly.
There is
alot about the underlying platform of windows you would need to understand as well for the MCAD. For the Java certs you would need to kow the Java/J2EE platform.
Good luck
Sal