I plan to go Road trip in Georgia and Armenia. Can friends who have been there give some advice ?

Website rental cars expensive, just go to the old town of Tbilisi to rent a personal one, 30-50 US dollars.

I haven't been to these two countries, Serbia and Bosnia and Herzegovina.

If places like the Ushguli in Georgia are not suitable for Road trip, the roads are quite bad.

Road is narrow, especially in tunnel, drive carefully.