Is the CompTIA Security+ recognised worldwide like the CISSP?
I believe CISSP is more recognized because you cannot get certified by solely passing the exam. You will only get certified if you have 3-year working experiences on Security related jobs.
Which one is worth to take? The OMG UML cert. or the IBM 486 and 633/634?
OMG cert is more technical, you need to know UML in detail, down to specification level.
IBM 486 focus on application level. You need to know how to apply UML knowledge on systems. However, you will not receive any certificates after passing this exam solely. You also need to pass IBM 287, 484 and SCJP in order to get ICED 5.0 certificate.
IBM 633 and 634 are exams for rational. You will not get certified even you passed these 2 exams. You need to be worked in companies that are IBM Rational Partners.
Do check the certify requirements before considering to take an exam.