Originally Posted by
Eric Bryant
There shouldn't be any noticeable difference in torque ripple between the two; delta is technically a bit worse as the circulation current causes a bit of current ripple (and thus torque ripple) in some of the upper-order harmonics (3rd, 6th, and 9th ring a bell). That being said, the ESC behavior with the two different types of motors is going to play a significant role in how the overall system behaves.
I don't think it matters much for rc applications but both winding configurations have harmonics, in power systems delta is preferred as it provides a circulating path for harmonics rather than returning to the supply with a star winding.