Hi,
Are you about to work Java in a company ? If yes, then what's going to be your position ? If you are going to work as a core Java developer, then go for
SCJD, if you are going to work as a web developer, then go for SCWCD, if you are going to deal with business components, then go for SCBCD.
Now, if you are doing these certificates personally, then SCWCD may be the right choice.
All after all, it's your decision ...
Regards,