EK ? Maybe not , if you read what people seem to think of them in the Forums here.
Of the other two, I have no involvement with either but it strikes me as a no-brainer.
Korean- same aircraft type and size, no command possibility, sparse social life, and maybe you won't have such a laugh at work when you fly with the locals & not the expats ?
Qatar- new type rating on a modern wide body, possibility of command, see the world a bit more while working, probably more social life with other expats.
You could end up hating either or both, but it strikes me at your age & experience the Qatar gig opens up a lot more possibilities for the future.
Even if you like Asian women, I don't know if the guys there are getting much action, easier to have a Philipino (Filipino ?) maid in Doha.
otherwise known as a LBFM.