Roads in Georgia are not always paved, despite beeing posted as highway, so expect some portions unpaved. You will get enough info there (Tbilisi) but as general idea , Kazbegui, Mestia , Batumi and its autonomus region, bojormi , are worth a visit. Always ask for local info about the road status, whatever they tell you inat the tourist offices.
Armenia is more the same with regards roads , the main one crosses the country to the south ( Iran border), it is in good shape. if you decide to go to Nogorno karabah you will need to apply for a visa at its border. The good things is that generally the border police speak English and they tend to be quite friendly with foreigners.
Be aware the Armenia is has it border closed from Turkey and Azerbaijan.