HK 4025-1100 or HKIII 4025-1100 ?

[Heli_KV]

It is time to change motor on my Logo 500 3D. I use Hacker A40 10L at the moment.

The question is to go with HK 4025-1100 or to pick HKIII 4025-1100?

HKIII is heavier, but claims to be more efficient.

My Logo swings 553mm blades, ESC is Jive 100lv. I'd prefer to stay with 5mm shafts, unless there are reasons to go to 6mm. For this matter, having HKIII, I would need to replace shaft to 5mm.

Any advises will be helpful.

Thanks!