I'm a small engine mechanic and Husqvarna and Stihl dealer here in norcal. In my opinion either brand is great what's more important is fit and function. As mentioned above go with a local dealer that can service or rent pair it, not all dealers carry both Stihl and husky. As for echo and...
Its a hard call i have never had a foam but do have a 10cm thick king single self inflating roman one with the blow up pillow etc i the 4wd monthly was doing them to... I bought a second one for a simpson crossing last month and it was punctured day two and sh#t there after and that was done...