I was going to stay quiet for a while but...
Noise:
I have two Warn units that are several years old (10+?) that do fit loose/rattle inside the receivers when moved about. I can't say that I have heard that looseness/noise, as for most of their lives they have been used on an F350 Diesel and it would take a very calm condition to hear the clevis mount rattling.
I do remember noting the looseness upon installation, wishing it fit better (but I had no reason for this other than it seemed to be quite loose, held only by the pin). It is certainly possible that if I used my Warn clevis recovery mounts on my much quieter and smoother riding 4Runner that I would be able to hear the clevis mounts rattling when on-highway, and it might bother me some. The 4Runner is so quiet and rattle free that I can hear my rear tire swing-away squeak if the latch doesn't stay up and completely tight.
Loose Fit:
Though I wanted a better(?) fitting clevis mount it’s possible that the looser fit may be a design feature. On a few aftermarket bumpers I have used, solid 2" square ball-mount towing hitches do not fit into the receiver provided with the bumper. My local trailer shop explained that many bumper manufacturers don't use the proper 2" receiver tubing material (whatever it is) but use generic 2" tube that is of a difference specification, slightly smaller. I have had to grind away material on the male end/shank of the tow ball mount on two hitches, one a load-distribution hitch for a travel trailer and another a 10-inch drop ball/pintle combo mount to make them fit into the receivers on my current Reunel and CBI rear bumpers. Hollow 2" ball mounts are slightly smaller, with rounded edges, and I have not had to modify these mounts to insert them into aftermarket bumpers/receivers.
If the smaller external dimensions of the Warn type clevis recovery mount was designed to fit any/all 2" receivers, that was a very sharp move. Maybe it was just luck or they were using less material?
Finish/Function:
My clevis mounts have ridden in the receiver mounts on the F350 for most of their lives, the front one is rarely removed. When removed, I have noted some light surface rust on the finish, on the bottom side, but surely this is a cosmetic imperfection that doesn't affects the function and it not visible unless removed.
Yes the Viking unit looks better and I do like that, but I would not like if it looked worse after a few years. However, if it worked better I may still prefer it. Upon seeing it in this thread for the first time, I noted two things immediately; that it is 'sharp' with its bling finish, and that it has the flexibility to be mounted horizontally or vertically.
The latter point I thought may have a functional advantage on a severe side pull, but I will leave that argument to those that know more about recovery than I.