Take the command.
You will be at EK for a very long time as an FO. I've heard from a few sources now that time to command is upwards of 10 years. That means you will be a 53 year old FO. When you do upgrade here you will only have 11 full years of command pay. If you stay at home you will have double that... It is a no brainer if you ask me. Stay and enjoy your command, your home country, and don't uproot your family.
It is a mistake to come and work in the ME unless circumstances force you to.