Where to go? New room or upgrade

Hi ,just wanted ask which would I need to prioritize? Should I go for the next room (Sales?) or upgrade the existing first? Currently I have

Engineering - 10 Aeronautical -6 Packaging - 6 Forgot - 8 Workshop - 8 Astronomy - 2 Laboratory -3 Lounge - 10 Robotics - 1 Backup Generator - 4 Underforge - 4 Dorms - 4