With so many different ways to connect the fly line to the leader how come no one ever mentions using the perfection loop? Would this be a viable connection?

What is your favorite knot to use for the fly line to leader connection?

I was thinking of using a perfection loop since I change from a sinking leader to a regular mono leader to a piece of straight monofilament (short-line nymphing) throughout a fishing day and a loop-to-loop connection between fly line and leader makes for easy quick changes.

Alberto