@KEW - DPL does in fact have their own certification program as does THX. Both are "competitors" of HDMI.org's ATC's (Authorized Testing Center). The nice thing about an ATC is that it is standardized so any cable mfr can submit their cables to an ATC for certification. The protocols are designed and implemented by HDMI. org, as I have mentioned before. These are the same folks who got us in this HDMI mess in the first place so I'm more comfortable using a cable that has been certified by them and not anybody else. It's not cheap and that may be why DPL has their own as well as THX. You would probably be ok with a DPL cable or one that is certified by THX but I think your cable choices (mfrs) and pricing are better with an ATC. Besides, an ATC certified cable has the QR label for authenticity so it's very difficult to counterfeit the cable. I don't know how DPL or THX guarantees that one has purchased a "real" cable and not a knock-off.
The ethernet option is pretty much meaningless because there are no consumer devices that take advantage of that channel, but it is part of the HDMI specs and cable mfrs love to push that. Some device mfrs may use the ethernet channel for eARC but that is far from certain, at least last time I checked.
I would use the DPL tested cable and send the other one back. At least you know the DPL cable was tested by a proprietary testing program. Gold plating and silver plated copper connectors doesn't mean much. Any advantage by both is beyond what the human eyes and ears can accurately perceive. The cables look thick, and they would have to be for a passive cable to pass testing so be aware of the bend radius because you don't want to put any undo strain on the HDMI inputs.
Certification by anybody is not a 100% guarantee that the cable will work in any given system. 19' is starting to push the 25' maximum certification distance so keep that in mind. Hopefully you'll be running the cable in a conduit because that is the ONLY way to future proof cabling and chances are you will be needing to upgrade the cable probably sooner than later.
ATC is still pretty much the gold standard for certifying passive cables and is the only certification program that I trust and would use for 4k HDR up to about 20'. Anything over that your best, and most reliable option is a hybrid fiber cable from Ruipro. Active cables can't receive a certification from an ATC because HDMI.org does not allow for active cable certification. That being said, Ruipro submits their cables to an ATC for validation following the HDMI.org protocols and testing devices, they just can't say they are certified nor receive a QR label.
