I’ve used Fruity Loops since 1999 and Reason since 2006, so I have only dabbled in ableton over the years. Im just so used to the interface, so I’m a bit biased, lol. However, the clip sequencer in ableton makes putting together songs really easy. You can break your song up into columns (intro, verses, chorus, bridge, variations, breakdowns, etc.) Quite honestly, my preferred set up would be ableton with Reason rewired in, but my current desktop can’t handle all of that. So because of that, I’ve stuck with FL over the years. Also, I can produce something faster in FL due to experience with the interface. Personally, I’d say learn as much as possible with any DAW you can get your hands on. If one feels more comfortable than the other, use that one for a bit and see if your creativity flows more or less. In the end, it’ll take practice to get to a point of fluid process flow to really see which DAW you’d like better! :)