Really don't matter if it's a Stihl or a Echo or a husky or whatever. It all comes down to running a sharp chain and not using corn squeezed gasoline in it because when they sit with corn squeezed gas in them, it becomes a crap shoot whether they will start when you need them after sitting for a prolonged time, why I run Alkyd (canned gas) in mine simply because they may sit for months on end without using them and I want them to start and run reliably.
Nothing worse than phase separated pump gas in a saw that requires a carb rebuild or replacement to get it to run when you need it. Make no bones about it, e-gas will phase separate and gum up a carb if let sitting for an extended period of time. That don't just apply to saws either but anything with a carburetor, motorcycles and ATV's included.
That of course is a non issue with canned 'gasoline' because it contains no corn liquor. Of course canned gas is a lot more expensive than pump gas is but rebuilding or replacing a gummed up carb can quickly add up to the increased cost of the canned gas. Why I use it.
My saws can sit for months on end and start right up, no issue. Like my Stihl FS66 brush trimmer. It sits all winter and always fires up reliably in the summer, when I need it to run.