Adobe Premiere Pro CC. It is the most sextastic editing software I've used so far.
My experiences:
Sony Vegas
Pros: Editing is intuitive, simple, and fast. Unusually good audio tools.
Cons: Rendering is terrible
Premiere CC
Pros: Can do motions, effects, etc with ease. Built in H.264 is fantastic for youtube.
Cons: Not intuitive, takes a while to learn
Avid
Pros: Industry standard
Cons: Couldn't figure out how to even use it lol...
I haven't tried final cut cause I don't have a mac, but I hear great things about it plus its industry standard.