I guess you are working with Air India at the moment, which is like hell, I can understand and I assume the other airline which you are getting the offer from is Indigo.
Honestly you will regret moving from LHS to RHS, EK might be good for you but it has its own problems.
If you are thinking you will get all the luxuries and free first class tickets and god knows what, then well forget about it.
I would say join EK for the experience, get more flying hours, but it will be very tiring. You are 27, thats young, so try it.
A friend of mine LHS was working in Indigo, he went to LHS Air Arabia rather than EK RHS.