Sprenger RS Dynamic Vs NS Team up.. Any difference?

I have both of these; the RS Dynamic with a fixed cheek 14mm and the team up with a loose ring and 12mm. Both of the horses I tried them on preferred the NS. The only difference I can see is a slight difference in the angle of the lozenges.

The fixed cheek may have made a difference, though, as my TB prefers a KK ultra to the team up, and I think my youngster only prefers the team up because it's thinner and he hates tongue pressure.
 
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