I cannot speak to the quality of the Nanuk, but recently purchased and used two of the Pelican cases.
Yes the latch does click loud. Doesnt bother me. It actually makes sure i know its closed. But loud yes.
I received my largest pelican case from b&h and it was cracked on the bottom. I ordered another and used it on a recent overseas trip(shipped under the plane)
It fared well and inside it i had a tripod, and some of my most precious cargo. Including coffee
I am very happy with purchases on both pelican cases. I have become more exhausted of carrying my 1540(i think) around for just regular usage. I will probably switch back to my natgeo backpack for most easy occasions.