I wasn't aware that there was more than one way to notch when falling a tree (that's what you're talking about, isn't it?) until I saw 2 old geezers out cutting firewood with an old Homelite gear-drive and a little McCulloch: guys used a wierd cut...instead of a normal looking notch, they made two parallel cuts a bit more than 1/2 way through, and 3" apart. After that, a splitting wedge was used to split the slice out, then the saw was started again...the back cut was begun about 18" above the notch, angling down toward the notch at less than 30 deg from vertical.
Their explanation was that they never ever would have a barber chair.
I've never seen anything like it since, nor have I seen the odd looking stumps left behind, before or since.