How to differentiate between Roland Berger, Oliver Wymann, and Arthur D. Little in Dubai?

Roland Berger, Oliver Wyman, and Arthur D. Little all have strong presences in Dubai, but they differ significantly in scale and focus. 

1) Oliver Wyman, with around 400 employees in Dubai, is the largest of the three, offering breadth of expertise and access to major transformation projects. 

2) Roland Berger, with over 200 consultants in the Dubai office, combines strong European roots and entrepreneurial culture with deep regional impact. Especially the European industrial knowledge of RB is highly regarded around the world.

3) Arthur D. Little, with fewer than 200 employees, is smaller and more niche, making Roland Berger and Oliver Wyman the stronger options for those seeking both career development opportunities and large-scale project exposure.

So I would tend to go for OW or RB 

I would go for OW if i were you. I haven't heard from RB and ADL. OW is quite solid but work is not as exciting as MBB.