I'll chime in, of course.
I wouldn't even say the quality is an issue worth discussing. Shindaiwa/Echo(both under Yamabiko now), Stihl, Husqvarna, are built to the same standards. All saws nowadays are EPA choked, and have similar power for their displacements, etc. The Husky AT and Stihl M-Tronic are notable exceptions, as are their prices. I have been using saws off and on for 25 years now. Until the electronics made the scene, they have all been more or less the same for quality and power.
It is astonishing how much marketing plays a role in branding. People like the policy Stihl have of no internet selling etc. "Face to face customer service" is what it's all about, etc. This policy has little to do with the consumer - it is to protect the dealers, but marketing says otherwise, and folks believe that nonsense.
I have had completely abhorrent service from virtually all saw dealers in my lifetime, and great service from all likes. Service has more to do with the shop than the brand.
What matters to most is the support. If you do not work on your saws, or are flat out unable to, support matters. In such a case, this will drive purchases and create brand loyalties. And for good reason. What ya need to consider is if that Shindaiwa/Stihl/Husky does fail, and you need a part - does your local guy have it right here right now? Do you have spares?
If you ask me - if you make a living with equipment, you need to know that equipment inside and out. You need to be able to make it work if it fails because it undoubtedly will fail you sooner or later - no matter the brand, and I have used them all. If it hasn't failed, you haven't been using it. Let's be honest here - it does not get any more simple than a petrol powered chainsaw as machines go. You can probably fit most saws on three pages of IPL, including an exploded carb view. Know your equipment.