I've had Husky floor liners in vehicles over the years (before I ever knew about Weather Tech). I liked them because they do contour to the floor and protect the carpet, but the "lip" that stands up on the edges tends to roll down and look silly over time (still do the job, but just look bad IMO). I put Weather Tech DigitalFit liners in my 03 4R back in 07 and the carpet looks awesome still, as do the liners. The perfect fit and the protection makes the Weather Techs a no-brainer.
Getting back to the OP's question, I'm sure the mats will do well, but the liners will definitely protect more. As to whether you should keep the mats or get liners, I would go for the liners. Unless the person that gave you the mats will be riding in your Runner much! Then you might have to just keep the mats, right? :biggrin2: