Differences between nuke, fusion, AE, combustion, flame etc.? The best ?

Hi,

I'm coming from After effects and wanted to learn a more advanced compositing software...the problem is that i'm lost with all those compositing software avaiable on the market. But i saw here and there that nuke is top software and the future of compositing softwares and more and more used each day by studio and sometimes big studios for american movies.


1) What are the difference between combustion, flame, flint, lustre, nuke, fusion and after effects? All seem to be compositing softwares, but are there things you can do with one of them that you can't do with the other ?
when you go on website of each software you can see for example "nuke as been used in "movie n°1", you go on other compositing website and you see the other software has been used too for the same movie.
So i imagine they are different... if they are not, why work some shots on one software, then some on another etc.


2) What is actually the most used software by studios in average and big hollywood movies ?

3) What compositing software is generally speaking the best (by its functions and capabilities) and have a good future front of it (i would like to learn good a new software and open one day a dedicated VFX studio)

Thank you and sorry for my english, i'm french