I tallied all the votes for every post here. 7 people voted for Batumi while 3 people voted for Tbilisi so far. In percentage, that means 70% of all votes went for Batumi vs. 30% for Tbilisi.
Batumi did very well in this competition so far.
The different reasons listed for people voting Batumi was for it being milder than Tbilisi, and Tbilisi being too dry while still getting almost the same exact amount of annual sunshine as Batumi.
People that picked Tbilisi picked it for being drier, marginally/tiny bit sunnier, and having warmer summers and/or colder winters.
Personally, I picked Batumi because Tbilisi is too dry for me and I dislike that Tbilisi gets roughly the same exact amount of annual sunshine as Batumi despite the much lower precipitation.
I actually prefer Tbilisiís warmer drier lower humidity summers but the things I like about Batumiís climate still upstages that. If Tbilisi got at least 20+ inches of precipitation more, and being a little bit warmer some months in winter, then I would have picked Tbilisi instead.
There are pros/cons for each of the 2 climates, and I can see why someone would pick either one.