What are some alternatives?
When comparing Ableton and FL Studio, you can also consider the following products
NanoStudio - NanoStudio is a recording studio for iOS, OS X and Windows.
LMMS - Make music with a free, cross-platform tool
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
Ardour - Record, edit, and mix on Linux, Mac OS X, and Windows.
Sampulator - Make (and record) beats on your keyboard
Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.