Reaper, because Cockos understands and respects their customer base. Additionally, Reaper is top-tier quality.
Music and audio production
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I use Ardour. It looks pretty complicated to use at first glance, but everything you would need is there in one of the four modes in the top right corner.
I've tried Reaper for the plugins and the generally good reputation, but I couldn't understand the empty interface whatsoever.
Ardour is the best FOSS option, but I personally like REAPER a lot more because it has extremely flexible routing, JS plugins whose code you can read and edit within the DAW, and extremely flexible interface design that you can fit into any workflow. Also REAPER works on Linux. REAPER allows you to use the free trial indefinitely with full functionality (although I do own my copy, and it's one of the few pieces of software I think is worth paying for).
Ardour is the most popular (and probably most robust) option for Linux, and also available for Windows and MacOS. I don't think Reaper is open source, but it's "free" and by all accounts from people I know who use it, it's a great DAW.
Keep FL it is the best and take a one shot licence
Oh, I have the all plugins version and am absolutely keeping it. MIDI can be super clunky with FL Studio at times, but, it's super easy to script around some of those issues with Python if I really need.
I was just reaching for additional options and wanted to see what else was out there. The more tools I know how to use, the better.