I have found that the Stihl chainsaws serve me best. I used McColloughs in the service when I was in construction engineering but they always gave us headaches and it was difficult getting the fuel mixture right. Some years later my brother gave me his Poulan 'cause he was sick and tired of always pullin on it to try and get her started. I gave that one away.
When I decided to heat my home with wood, some 25 years ago, I took some forestry classes that were necessary to get into the Upstate NY forestry areas to cut firewood. Their basic premise, other than safety, was that to be safe you should have at least a 3 horsepower chainsaw with a 16 - 20" blade to prevent binding on longer blades and to give you sufficient power to cut through large trees.
So, I got myself a Stihl FarmBoss, the O41 Model. And I still use it. I have dropped trees on it, cut through barbed wire and rocks with it, dug out stumps with it and even used it to block my private road when a couple of theives decided to check out my neighbors house. I forget how many chain bars I have gone through. But, since I found I could still get that one bound or hung up, I bought a larger one with 4 hp, and that will eat almost anything.
I prefer using the 'chipper chains' with the anti-kickback link, having seen a few guys come into the emergency room minus a ear, fingers, hand or part of their face. But, Stihl is my saw, thankee. Mikey.