So it's worth mentioning that I'm not using Bitwig, but my needs are very different.
From what I've seen of it, it's got a lot of that 'modular feel' that Reason has. No idea how well it will do with composition and all that. I'd presume it has a pretty good MIDI editor.
FWIW, I've been using Studio Pro (nee Studio One) for years and really like it. But the Linux version is wayland-only and can't display 3rd-party VST GUIs unless they're coded specifically for wayland.