Yes c14 is best, but you have to get lucky. And as I adviced, do some research on the components you want to use (like you always should on sff builds anyway).It is not discontinued, it is only the former version C14 which is disconnected. See:
Discontinued Products - Products
Designed in Austria, Noctua's premium cooling components are renowned for their superb quietness, exceptional performance and thoroughgoing quality.noctua.at
But from my research looking at dozens of benchmarks, it does not seems that the performance are that exceptional compared to a Kabuto 3, or a dark rock tf.
Plus there are also issues with some motherboards like the Asus rog strix Z390i where the IO shield is too big and the C14s cannot be used.
In my understanding, the C14 was popular because you could mount 2 fans and it would still fit in the M1. Which is not the case for the C14S.
So I would also support your choice for the be quiet one
Before you buy a Dark rock tf, take a look at This log and recommendations. This guy had so many challenges and would not recommend this cooler.
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