Hi everyone! I would like to know what is the best CFD software? Thanks a lot!

Not this old chestnut! You will have to be a lot more specific as to what your requirements are, it's a bit like saying "what's the best car?" without saying if you want a sports car, a family car etc etc

... or a taxi. I.e. it might be better to not drive it yourself.

or just stay asleep because the whole thing's turning out to be more involved that you can be bothered with.