Lately AdS/CFT seems to have been a very promising tool to simplify calculations in HEP (ex. quark-gluon plasma) and offer some insights into quantum gravity. I was considering doing a Master or PhD thesis in this field, but I'm wondering if the prospects are more reasonable than just string theory or it would be better to go towards something more concrete like QCD lattice or SM precison tests. I've read mixed reviews about it being a very hot topic of research (especially in the US) while others say it barely makes testable predictions and it is better regarded as a mathematical theory. In particular, my goal is to find a good post-doc after graduate studies, or at least find a job in the private sector but still be involved in research in HEP. Moreover, I'm both interested in the mathematical beauty of physics theories as well as their experimental confirmation.