Do we need 6-8poles motors for 1/8 ep?

[jsr]

Higher poles have more "available" torque. It doesn't mean all of it will get used in the application as it depends on the load that's presented to the motor. I think the advantage of higher pole motors is that you can use smaller motors that provide enough torque to move the heavier 1/8 scales around. A 1/8 buggy isn't that bad, but a 1/8 truggy and especially 13+lb 1/8 MTs can require quite a bit of torque to push them around efficiently. I think as you move higher in pole count, you can move down in size, which has the advantage of weight and space savings on the truck.
I've been looking at the 36x56mm 6-pole on Tower. I think it would move a 1/8 buggy just fine.