Hello....
i own 4u thruster f enhanced (already sold) and 3u auraspeed 100x with power ring
the smash power is higher on thruster F, but the head and sweetspot is smaller so its hard to generate a stable strong smashes, i always miss the timing and miss hit the frame... thats why i sold it
from my experience, the smash differences is not that far (maybe it would be different if the pros smash it

)...
with aura speed 100x even though it is 3u, the swing is faster especially for drive, defence is easier, sweetspot is huge, forgiving for miss hit, control is SSSSSSUPER !!,
it's not worth sacrificing the speed and ease of use just for small differences of power...
im not fond of power racket so my answer is 100x power ring the best racket in the world for me 10/10 Rating for all categories...