The advantage to leaving for work before 7:00 in the morning: you can cross Byres Road whenever you feel like it, regardless of the direction that the light favours.
The disadvantage: I just said, “before 7:00 in the morning.”
The advantage to lecturing on a topic outside your area of expertise because a colleague has flown off to a conference: you can catch up on a fascinating subject much controverted in the scholarly literature.
The disadvantage: Not much time for mastering, or even noticing, the nuances of the controverted subject.
The advantage to walking three-quarters of a mile to work in a Glasgow downpour: Nope, no advantages to this one.