For me....
FL = Make an allgood beat in 5 minutes with samples and thats about it.
Logic Pro = load up a professional interface instrument, play, write, record tunes, edit, master, bounce, money.
This is my experience with Logic as compared to FL anyway, however FL is a great software to learn with and mess about with in a short period of time.
Of course with FL you can plug in a midi and do all sorts of other things but i didn't bother doing so as i jumped to logic because i found the sound was more real than software sounding with Audio Units rather than FL'S VST'S.
My opinion, each to their own, and as both software are different in their own way, theres things that each do that the other one doesn't.
Happy beat making on whichever choice you make.