Every filament - literally 100% of them - will print better when dry. Brand new filament can be wet. PLA, sitting in my printer for a couple weeks, can get brittle enough from absorbed moisture to crack in a dozen places in the ptfe feed tube. So yeah I guess petg is moisture sensitive, but my take is that everything is. So I would recommend a filament dryer, and using it on new spools and spools that haven’t been used in a while.

Vacuum sealing will help, but I still dry filament after storing in vacuum sealed containers.

That said, you could also just wait until you see signs of wet filament before drying (stringing, bad surface finish, etc).