If you can do better in India, stay there. If you want to fly 777s or A380s worldwide and upgrade in roughly 7-10 years, go to EK. Keep in mind it could take 20+ years to upgrade in a UK or US legacy airline.
Don't expect EK to be perfect by any stretch (go with your eyes wide open and your expectations in check) - but compare it to your current situation and make the appropriate decision.