I can either dive or be a buddy (babysitter), I cannot do both... and I love to dive.
This has to be the toughest skill to master.
Changing between the wetsuit and the dry in the same day, and remembering whether you're allowed to 'warm' yourself... ;D
If you're doing it right, it shouldn't matter...just that one is more effective than the other since it's going right out into the water