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The Weathertech floor mats have channels almost as deep as the factory mats- still decent. I had a set for my 370Z since Nissan does not think anyone is crazy enough to drive that car in the winter. I am!
The Weathertech floor liners cover more area, but are more flat without channels so snow, ice, and other winter slop moves around more. (This is a problem for those of us who like to go around corners sideways in the snow.)
Years ago, I bought Weathertech rubber mats for the wife's car. They're OK, neither better nor worse than my OEM Infiniti rubber mats in my car. But I've not seen the Digital-fit plastic ones before.
This picture is from the WeatherTech website, of the Digital-fit Mat on the G37:
IMO, it doesn't really look any better than the rubber mat... just hard, is all.
And I could do without the WeatherTech logo being so much in your face.
It looks like the Weather Tech mats would leak around the two posts that secure it to the floor. Whereas the OEM one's holes are more shored-up. or at least out of the channels.
I have a set of the OEM mats. I love them because they are easier to keep clean all year long, just pull them out and spray them off. I also think they look sportier and they give floor of the car more lines and contours. IMO.
DO NOT get weather tech. Its a quality product but the OEM all weather is FAR superior. I used OEM Infiniti all weather mats for the past 8 years through my last 3 Infiniti's and they are solid in the winter holding up all the snow and containing all the water and other yucky stuff. I've never had to pay for the all weather mats since I always tried to get it for free from the stealership (although I'm sure they make the money somehow from me).