i actually enjoy working on mew a lot more because its hands on, im doing more actual work and the game is more creatively open for me to improvise around. working on rebirth is 99% design work, so its just me writing design emails, sketching enemies and the like and then just approving things as we go.
i guess its what designers usually do.. but im used to actually doing a lot more work on a project and i like to stay very busy.. so mew is more fun to work on currently.