Chainsaw finally gave it up. Been using a Husqvarna 455 for about 10 years and it was a quality saw. Anybody have a real world comparison between the Husqvarna Rancher and the Stihl Farm Boss? I'm felling hundred year old white oaks or any serious chainsaw work. Need a 18" - 20" bar and will be used primarily for cutting downed trees and cutting up firewood.