Before we get too far, you might want to check out the
naming policy here before the Sherriffs or Bartenders bother you about it.
With regards to your question - I think what would drive me would be a matter more of what kinds of firms are you looking at for employment. I've found, personally, that both are equally helpful in the sense of drawing attention to one's skills. However, my 'problem' as it were with the IBM track is the rapidity with which they replace versions of their software and 'expire' certifications, and as a consequence have been preferring the Sun exams.
However, if most of the firms you're looking at are Websphere shops (or you work at one such firm), then you might be as well served by the IBM track of exams.