score:4
It turns out that Ortachala and Didube are not the only places to catch a bus or marshrutka in Tbilisi. It's easier to find the departure times on the Internet when you know the names of the others. Here is the full info compiled from the official government published Tbilisi Guide tourist information handbook:
References:
travel-tbilisi.com
(for explaining the locations and names of the bus stations)Upvote:4
How's your russian? If good take a look at the discussion on batumionline.net
If not I will attempt to translate:
Marshrutkas are leaving from multiple places for Batumi.
One of the things that I have been able to find and most people claim that travelling by train is better either via express or overnight passenger. Both of which can be found at Georgian Railway Site. Just FYI Batumi = Makhindjauri