OK I am not a tutor but may I say that there are still producers out there who use FL Studio and I am sure you are aware many tuts out there on how to use the DAW
I can’t say which is the easiest to learn as everyone has differnt methods to learning and work in differnt ways
What I would recomend is download demo copies of Cubase, Ableton etc etc and see which one you feel most comfortable with - also watch the basic tutorial vids and eventually you should make the correct decision for you - or stick with Fl Studio