The majority of the world's ATCs are enroute controllers. It is, generally-speaking, the most in demand ATC role. However, because it's also the one in which the most number of candidates exist to fill vacancies, it does mean you're unlikely to see adverts in Australia to fill enroute vacancies in Europe unless you go looking. (Just as most of the world's teenagers work for a red-headed clown in a yellow suit - I've never seen him advertise, nor ever be short of staff, and yet I'm confident if I asked him for a job I'd have one tomorrow if I were flexible on location.)