Here is a good link that shows BLDC commutation.
The difference is that in a BLDC two phases or conductors are fed at a time, simulating a DC motor turned inside out. The 3 phase sinusoidal has current fed to all three conductors phase shifted at 120 electrical degrees apart.
An 8 pole motor is superior to a 6 pole in that there will be 4 electrical rotations per mechanical rotations in a 8 pole compared to 3 in a 6 pole.
In spite of many concerns that a BLDC possess coarse positioning at low rpm, I am using them with a Galil card direct drive to a B.S. with 2500p/rev encoders and can position within one pulse.