We can say that each direction has its pros and cons. Tbilisi is a year-round in-demand location for tourists and expats and capital of Georgia. Batumi is in super high-demand in summer, but the rest of the year you should count only on expats (whose number seriously grow). Bakuriani and Gudauri are winter resorts, where biggest revenue you get in winter from tourists coming for skiing. However, Gudauri is more expensive in that period of year than Bakuriani, but Bakuriani is in demand in May-Sep periods as well, as many locals are taking their families there for clean and healing air, coming from pine trees.