Hi Anonymous,
In principle MBB brand is recognized the same in Middle East vs. Western Europe.
However, it mostly depends where you want to spend your time afterwards. If you build your knowlegde and network in Middle East environment, it will be slightly less valuable if you want to return to Europe afterwards - and vice versa.
Also, internal transfers are possible but usually only granted to top performers and there is by far no guarantee that it will finally work for you.
In short: Unless you have strong reasons to do otherwise, join MBB in the region in which you would like to stay in the long term!
Hope this helps - if so, please give it a thumbs-up with the upvote button below!
Robert