Industry strandard. One of the first DAW, this software is still one of the most popular amongst pros and can be foung in the best world class recording and post produciotion studios. Great for big and small recordings, editing and mixing.
If you know Pro Tools it will be easier to understand the other DAWs and you will feel right at home at any studio and any situation you fing yourselt in. 

Great for both recording and production. Comes loaded with virtual instruments, plugins and samples and is very reasonably priced. Mac only though.

A perfect fit fot hip hop and EDM producers. Large session multi track recording is not Lives storng side, but Ableton offers lots of unique solutions and workflows that fully makes up for it. 

It is also widely used on live performaces and combined with the Push controller becomes a nothing less than a musical instrument!