The only chainsaw I have used is my Stihl Farm Boss. I had to replace the main bearing last year, after abusing it for 5 years.
It starts easily, runs well, cuts big trees. It hasn't cut my leg off, yet. Give me time, though.
I use it at our farm to cut fire wood, make shooting lanes for deer stands.
I'm no lumberjack. I'm good at pinching the bar in the tree.
Husqvarna used to be the best but they have gone down hill with there mass production so they can sell to all the home centers. Stihl was almost as good then, but have clearly taken the lead in most power tools.
I have only really used chainsaws for residential rough in work and occasional yard work so maybe not the best source. Because of how abusive I am to chainsaws, I buy the least expensive and just run it into the ground. The only one I steer clear of is Poulan...pronounced "pull-en" cause that's what you gotta do to get um started and to keep em running.