I use Pro Tools HD, Nuendo 8, Digital Performer, Ableton Live, Logic Pro X, Studio One Professional 4, and Reaper. Any of these will work for basic audio, and you only need one DAW. I work with a wide variety of professional producers, but its perfectly normal for a studio to only use one or two DAWs.

In my home studio my main DAW is Logic Pro X. I use this for composition, sound design and mixing. Also works great for working to picture. I do have Reason as well and sometimes use Rewire to bring in some of those unique Reason sounds I have into my Logic sessions. For large audio editing jobs - mainly dialog - I have Pro Tools 12 Native. It just has the best, most fluid audio editing workflow I've ever experienced. Aside from that, I sorta hate Pro Tools and REALLY dislike Avid's business practices. For simple audio editing at home I use Amadeus. Not my favorite but Bias Peak Pro is no longer supported and doesn't work with my current OS anymore. On PC I LOVED Sound Forge but the Mac version was so bad I just never looked back after trying it out. Maybe version 3 is better?? 

In my work studio it's much more simple - we use Cubase. I don't like some of Cubase's set up, especially when working to picture but it gets the job done.  For audio editing we use Audition, which is actually pretty nice. I just dislike how Adobe forces you into the subscription model for that program. 

I'm one of the few who uses FL Studio as their main DAW. I don't really believe that your choice of DAW matters too much in the end. Actually creating the music and arranging the instruments is the real work; the DAW just is your work-space for doing so.

I use Studio One 2 and Cakewalk Sonar X3. 

I don't have many virtual instruments, as I decided early one not to buy VI (bad advise though :P). Instead I have Roland FA-06 as my main sound module. The thing is, Studio One is not cooperating with external sound module very nicely: it lacks the feature to save bank/patch used in a track. I don't see this is coming for SO as no one really use external sound module anymore... (apart from that, Roland doesn't make a VI for their synth any more it seems).

So currently I mainly use Sonar X3 as it plays better with an external sound module.

I only use Studio One for video's audio editing and live recording (which I rare do one nowadays). 

Personally I prefer Cubase but couldn't afford it. The truth is, I've got those 2 DAWs from sales. I haven't got any DAW at full price...

When I'm writing music, I usually do it with Ableton Live 9, because I use Ableton Push A LOT. Once the music is done, if I have to record instruments or vocals I move to my studio where I work with Logic Pro X. Most of the time I also mix with Logic, but I would mix with Ableton if the aux channels and sends resembled more a mixing board and less a djing setup. Also, Ableton's display of inserts makes the workflow sluggish when it comes to mixing, imho.