We want to merge three active directories with on as parent in Dubai, then child in Dubai, Bahrain and Kuwait. The time zones are different and sites are connected using VPN/leased line. With my studies i have explored two options. One way is to have parent domain/forest in Dubai and Child domain in respective countries/offices; second way is to have parent and all child domains in Dubai Data center as it is bigger, while respective countries have DCs connected to their respective child domains in Dubai. (Personally i find it safer in second option)
Kindly advise which approach comes under best practice.
Thanks in advance.