Certification is not a panacea. Which one
you should chose certainly depends on your career goals. XML is an evolving technology and has a great potential to revolutionize the world of IT-Commerce( not eCommerce!! ). IBM's certification is the
only industry standard XML certification available as of today.
If you want to persue your career in the Java/Enterprise application field, XML certification will definitely help you.
Good luck,
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Ajith Kallambella M. Sun Certified Programmer for the Java�2 Platform.
IBM Certified Developer - XML and Related Technologies, V1.