There is no question the Weathertech's look a bit more refined but that's about where it stops for me.
We're not talking about "reservoirs" here. We're talking about full upward lip protection that fully blocks liquids from slinging toward the outside from centrifugal force when cornering. Weathertechs have a little vertical containment at the outboard edge but go just as high as the side sills and then have a nice contour that flows over the sill (like a backhoe front-end bucket). That's part of the Weathertech's pleasing fit and lines. The Husky Liners ignore the sills and make no effort to look cool at the sill, they just keep going up at the side to match the other 3 side's height at a miminum (like a stock tank). That's actually the main advantage I've found with Husky Liners (I have owned both Husky Liners and Weathertechs). Other things I like with the Husky Liner over the Weathertechs are as follows: full floor coverage up the firewall and under the driver's gas and brake pedals (Weathertechs also do that but not as far). Husky Liners do not have to use any plastic floor clips or velcro pieces to keep the liners in place (helps the dimwits at the car wash get them back in easier). My Weathertech's have also lost their logo badge and passenger kick-panel velcro stickum when the adhesive softens after a few weeks at Summertime temperatures.
In summary I think Weathertechs look nice and are far superior to any plain or weathery "floor mat". Probably great for everyday use and going to the mall. Husky Liners, while having a less-refined and more utility look give better coverage and protection with simplicty for folks who get in and out of their trucks all day with mud, dust, dirt and the occasional spilled ice chest.
To each his own and irregardless of which brand somebody goes with, liners are a very smart move.
I'm surprised anybody would even try to use the Toyota OEM carpet floor mats that come with the vehicle. They are useless for real pickup truck use and actually more of a nuissance than an asset. Put 'em away in a box for the day you sell or trade in the truck. Had I paid more attention when I bought my Tundra I would have told the dealer to keep them and give me credit. And then the big swirly OEM accessory rubber all-weather floor mats are nice looking but very small with a big chunk missing where you want it ... under the gas pedals (Lawyers once again). Unlike liners they have no side edges to catch the mud/water/snow or sick passenger spew. They just seem to channel everything right to the carpet at the edge of the mat as you drive along. I see no direct weather protection from that.
Now if we could get Toyota to offer a "carpet delete" option code like X and Y brands do, life would be great.