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I also have the all weather floor mats for my 2013 GS. I was disappointed that they were a matte finish rather than a shiny gloss black finish like the all weather mats in the CT and the older IS. I've had them for almost 2 years now and they show wear, especially on the flat parts of the mat. You can notice the discoloration even more the older they get.
I don't have any experience with the floor liners, but their weather tech mats are much nicer than the OEM Winter mats. When I got my GS they didn't exist for the AWD car, so I got the Lexus ones. They're thin because of the unintended acceleration Jazz. Had the weather tech mats been available I would have gotten them.
I got a free set of OEM Lexus all weather mats and gave them to my brother. The WeatherTech ones are much better. Better fitment and better protection. I had some Weathertech mats that are 15+ years old and they still look and work great.
I purchased OEM from Sewell, got 20% off by using ClubLexus Login. I am happy with them. Only have the fronts in. back seats have regular since no one really sits back there.
I mean, I'm not going to run out and spend $100 to replace the OEM winter mats with the WeatherTech mats now that they're available for the AWD, but had they been available...having owned both in the past, there's no way i would buy the OEM mats over the WeatherTech mats. Especially considering that even with the CL discount the OEM mats are basically the same price as the WeatherTech mats and the quality difference is huge. They cover the dead pedal too. If you only want the first row, you can buy just the first row.
Weather tech mats:
Better quality rubber, heavier, thicker. The real benefit is that the deeper grooves keep water down away from your shoes. The Lexus mats beat my shoes up...