Jesse the issue with any tyre is as they wear past 60% they get noisier. All to do with their design and build internally and externally. We have tested with Bridgestone and Goodyear for the last 15 years and across a lot of different 4WD tyres including development patterns and construction and that includes D693, D694 and D697 for development and durability. I know the tyre engineers well and from that comes a decent understanding and appreciation of how a good tyre gets built in the factory for subsequent abuse.
You have not mentioned if you are worried about load rating but are more interested in noise. So one tyre not so far mentioned is the Goodyear Silent Armour which is available in 18" with a LR of 109.  The new GG AT3 also will deserve a look for sure as both tread designs are quite benign.
We do >20,000km each year travelling outback Australia so a lot of time on and off bitumen. We want durability, LR, comfort and low NVH. So for us it stays as the D697 for the foreseeable future. As an aside we have specified the D674 on our new Quantum Plus not for those reasons but as they are readily available in the places we frequent, have a 123LR so are plenty strong enough to run the very low pressures we set in sand and rocky tracks and it has a very good chemical and engineered construction that should see them last quite a while
There is no such thing as the perfect tyre. Everyone has a different view and preference based on their experience and that can be over vastly differing terrain and driving conditions. Per comments in this thread if you are looking for something very quiet then linear tread blocks very close together. But that counts for not a lot if you want to regularly tackle mud for example. From there pretty much all the AT branded tyres are designed as crossovers which is where they immediately try to be not the best of both worlds but good in both. 
Rob
				
			 
			
		 
			
				
			
			
				Rob
MY15 TDV6. Compomotives with KO2's, Traxide 160-DBMS, Llams, OE bar, custom rear storage slide, Rhino roof storage system, LSM TPMS, ICOM 440N, rear ladder and GOE compressor guard
			
			
		 
	
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