Doesn't seem to be a "best" option, just best for your situation. That being said...
I did my mounts a couple weeks ago and replaced with the black polyurethane Daystars. I sprang for the kit that came with replacement hardware as well. (A relatively new offering from Daystar.) Haven't heard any "squeaking", but they're definitely a bit creaky. Doesn't bother me though, bang for the buck its a no brainer. Less than half as expensive as any other option, WITH the replacement hardware kit. Comes in at $250 from Amazon. I also hit them all with some teflon lube from B'laster, per recommendation from a forum post on some other diesel site. Dunno if it helped at all, but definitely didn't hurt.
I'm perfectly happy with the ride. Probably a bit firmer than stock, but way better than the crumbled OEM mounts. I wanted some extra firmness for the radiator support anyway. Ride quality is the only reason I could figure going with an OEM design, but its not worth paying for in my opinion, especially since you're gonna have to replace em every 50k. If it matters that much, go for the Dorman replacements over OEM. They seem to be better AND cheaper.
All in all, I'm quite happy with the poly Daystars, and would recommend. I DID have a couple issues with the integrated threads on the replacement metal Daystar "cups" included with the hardware kit, though. They seem to be designed for a 6.0L chassis that threads from the top down. Since 6.4's thread from the bottom up, into a cage nut, I had to drill these threads out. ALSO, I had a cage nut that seized and had to cut it out and pitched. So then I tried to go top-down and actually use the integrated threads for the replacement, but the weld point popped when I torqued to 50lbs.
Fortunately I was able to save a couple of the OEM bottom mounting plates, so I re-used one of those, just had to buy a new nut/washer setup. Hardware kit is handy, but has some flaws. I was mostly able to work around them. Probably won't have these sorts of issues with OEM or Dorman hardware.
According to Daystar their kevlar model is going to be even firmer than the polys, but stands a fighting chance at outliving the truck's frame.