Technically speaking I should probably be a fan of PRO TOOLS, but i prefer SONAR.
My background .....
I am 47 years old and grew up with big mixers, analog reel multitracks and outboard effects racks (ie..... the classic recording studio).
I worked with guitarist Yngwie Malmsteen for several years also.
I stayed loyal to analog until 1-2 years ago, but when it got harder and harder to keep my analog recorders fixed and running,m I decided to bite the bullet and move to the digital domain. I had used things like the Otari radar systems and stand alone Fostex digital recorders, but these were really just used as replacements for analog tape decks. All the same mixers and effects rack equipment was still used.
When I decided to switch to DAW for my home recording use, I tried both PRO TOOLS and SONAR.
I don't use MIDI, I don't use loops, I don't use sequencing, etc...
I only plug-ins for EQ and delays ..... for my reverbs I still run the signals out to a high quality Lexicon Reverb unit as I feel it sounds nicer than Plug-In Reverbs.
I record all Audio tracks on rock bands using real drums, real guitars, real keyboards, etc...
So theoretically PRO TOOLS should have been the more logical choice for the type of recording I do (since Pro Tools started as a pure audio multitrack DAW years ago)
However, after trying both systems side by side, I found the CONSOLE and TRACK EDIT screens on SONAR more logical and easy to work with.
I also liked SONAR's open system that works with any choice of interface card as opposed to Pro Tool's limited compatibility (I use an M-Audio Delta 1010 PCI interface).
As we all know, sound quality is really determined by the interface, not the DAW software so whatever is a friendlier work environment is really up to your personal preference.
I confess, If I knew I was going to be working with other musicians or bands or studios in a collaborative effort where we needed to share project files, then I would go with PRO TOOLS because it honestly does have the advantage of being the "industry standard".
For example --- how many major movie soundtracks or albums can you name that were recorded on SONAR ???
However, since I am doing all solo work in my own studio, I prefer the SONAR system.
I would like to see SONAR make more inroads into the professional music industry with more major movies and album releases produced with SONAR so that Cakewalk would get a more professional reputation and not only be viewed as .....
"the stuff amateurs and semi-pros use at home". It seems PRO TOOLS is still viewed as the professional's choice ......... while SONAR is still viewed as the software for all the non-professionals to use.