In the middle east, what are the main differences between Delta and MBB? 

Are they competing for the same projects pool? Do they have similar work life balance? Similar project destination (thus similar travel destination)? 

I'm asking this specifically because I heard unverified information that Delta (in Dubai) do a lot of private sector projects and typically expand their work out of the region, reaching Europe, as opposed to MBB, whose projects are nearly all focused on public sector in the region. Is this actually true?