I have a Poulan Pro 5020AV that i've used for cutting blown-down oaks for firewood. I've been having some trouble with the saw lately and am considering replacing it with the MS251. The Stihl has lower displacement and rated power, but I'm wondering if the Stihl is going to perform better for my application than my 5020AV. I've been generally happy with the Poulan, but I suppose I would always prefer something that cuts through logs faster. Thanks in advance for any advice.