Okay I didn't have room to give a rundown on my two biggest and baddest.(maybe I talk too much) Anyway I have never run a mcculloch 125 (though I would love to) so I cant compare that particular oldie to what Ive got. I can tell you that these two saws are by far the strongest two saws I have ever used. Homelite 990g this saw has a 2.8-1 underdrive and only has 6000 rpms of engine speed and that means only about 2100 rpms of chain speed, but let me tell you that the 2100 rpms you DO get is 2100 rpm no matter what! I run a 48" bar with a .404 full comp chisel chain and have the guide teeth cut down about 1/3 and I cannot stall this saw! Once I had the chance to test this in a 43" section of dry poplar, once the bar was buried I dug the spikes in and pulled up as hard as I could and the saw never even slowed. Sounds like a winston cup car. Stihl 090 What can I say? This is my meanest saw. The thing pulls like a gear drive but is a direct drive, so no rpms lost, cuts hard, cuts fast pulls 42" bar no problem and really throws the chips. Sounds like an indy car .