I compose solely in Propellerhead's Reason - I've used it for several years in the early 2000's from v1 - v2.5, then I took time to go "all analog" with synths and other recording gear. I got back on the Reason train at v7 with their Essentials, and now that I'm using it for my composition platform, I've fully upgraded to v9.
I've never been this happy with a DAW. I don't usually record audio, I synthesize it. If I need to edit audio, Audacity will do fine for me - I use Audacity for editing my Foley work for sound design, then I drag it into Reason and manipulate it there.
I'm used to Reason's workflow, as I was trained in a sound-engineering class from 1998 to 2001. Turn the rack around, connect the cables. It's that easy. If you don't want to do that, it automatically connects for you, but I like that I can change it to my will. The sound quality is excellent, and the piano roll works for me. I just operate that way. I learned how to use FruityLoops back around the same time that I was attending sound engineering classes, and I didn't like the software. At the time, everything sounded like it came from the same software, no matter how much I worked with it (and I spent several hours, every day).
When I moved on to Reason, it felt like a gate had opened, and I was privy to all kinds of new stuff; the sound, the synths, everything was better. Propellerhead hooked me with ReBirth, and then they made Reason. I was making Autechre and Aphex Twin style music back then, and it could handle it - I had a unique sound (compared to those around me) and I could do more.
Now, the sound has improved so much, the synthesis the Reason can handle has grown immensely. I'm a happy boy!