I think that depends on a bunch of stuff -- can you talk a little about why ffmpeg tempts you? Is it because it's free, because you're more comfortable typing commands than using a graphical user interface, maybe some other reason?

If you're just starting vidding, it might suit you to try a few different tools at first. I got a lot of guidance from the AnimeMusicVideos.org tutorial and WisCon vidding party online workshop, and thingswithwings's aspect ratio tutorials in particular when I started.