Noctua case fan naming

FunkyFeatures

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I am confused. They have FLX, ULN and PWM versions of their NF-A14.
The FLX has both ULNA and LNA adapters with it, and how i understand it, the ULN version only has the ULNA adapter. Why would i pick the ULN over the FLX version then? They are the same price. Does the ULN fan go lower than the FLX with ULNA adapter?
 
Solution
the uln are still slightly quieter. flx gives you variability between normal, quiet and very quiet. the pwm one gives you the choice to let her buck, giving you better performance in cooling at the cost of noise

FunkyFeatures

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Ok - Thanks a lot for making this a little bit more clear. That was confusing.

How i understood it - ULN going lowest, even though the flx has ULN adapter. PWM is just overall more performance, sacrificing noise.
I got it right, didn't i?