Georgia is one of my favourite countries, the food and wine are so delicious, and the people are so warm. If you want to go to Armenia or Azerbaijan, take the night train. It is comfortable and fast (compare to the bus). Especially you can sleep one night in the train to rest.
According to me and my friends, Georgian drivers are not wise drivers, they rush and push. One third or even one half of the cars running on the street are broken cars due to the accidents. That is why I highly recommend taking the train.