What certification is more valuable? CCA-V or Xenapp 6.5?

I'm ready to start studying for some Citrix certs, but I want to make sure I am investing my time and efforts in the right area. I've researched online and have seen mixed reviews. A lot of people are saying to stick with Xenapp 6.5 because that is what most companies are still using and most companies won't be using Xendesktop 7 for a long time. However, I'm worried that if I go for the Xenapp 6.5 certs that it will be obsolete soon. Can anyone please help me with some real world advice on this? Thanks!
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2020 Goals: 0 of 2 courses complete, 0 of 2 exams complete