Hi,
I think, knowing some of them, that they are actually very similar.
I suggest you to not loose too much time, but find one that seems ok for you (a friend's demo could be helpful in any) and start working focusing mainly on music.
When you will be an expert you will be able to catch different nuances of each program and make the final decision that perfectly fits for you.
Better starting with LE versions, usually cheapest, that in most cases fits any beginner need.
Hope this help.
Cheers.