Weather Tech Moulded mats are the best for keeping the water/snow in check. I have gone with the std weather techs and I tend to get dirt and such under them. I should have gone with the Moulded type Weather Techs.
I have had standard weather tech mats in a couple of vehicles and love them. It isn't like I am tracking loads of snow into the vehicles with me, but what I do track into the vehicle settles well into the trenches of the mat.