What is the best film editing software?

Final Cut Pro.

1- Final Cut pro
2- After Effects
3- Sony Vegas

Final Cut Pro

Final Cut pro if you have a MAC, Adobe Premiere if you have windows system.

There're so many good softwares to use in editing and each has its features but about myself and experince i prefe the Final Cut Pro X on others cause o the featurs an plug ins that let you handle whatever you want to do or to create the soul of clips.
Regards H.
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Final Cut pro or After Effects

I personally use two or three softwares simultaneously.
Either Final Cut & After Effects, or Adobe Premiere & After Effects.
However Final Cut is only for MAC so if you have windows you might want to grab the Adobe Softwares.

Final Cut