I like the flip-caps and captive bar nuts, fast and easy every time (I have both type of saw). I have a 1970? STIHL 015 with good fuel line, and so far haven't had any problems with fuel lines used with ethanol-free fuel on older saws. They also start well.
ECHO seems to be making good and affordable saws with 20-year-old reliable and affordable technology--they're like the Harley-Davidson of chainsaws, but more reliable.
Husquvarna seems to have moved much of its production to China and is at the moment seemingly suffering quality and supply issues, which historically seems to have affected every saw manufacturer at some point. The ones I've used are light, powerful, smooth, and cost less than similar STIHL models.
If I didn't have a great STIHL dealer I'd buy ECHO as they support the end-user with free parts manuals and affordable parts available on-line. No hate for any brand here.