I prefer using a braze on derailleur with a clamp-on band.

I could train a chimpanzee to tune a rear derailleur but fronts can be something else. I've found that most of the time, when I've trouble getting a front derailleur tuned, the underlying issue was the position of the derailleur on the seatpost. The height of the derailleur relative to the chainring can be a critical item and it can be hard to fine tune. The braze-on derailleur with clamp-on adapter allows me to adjust the derailleur height without affecting the positioning in any other way.