The general advice with digital is to shoot to the right. I think this comes from product photographers and people who concentrate on making a few pennies from stock photography, both of which want more shadow detail than the human eye notices, or even wants to notice. I think landscape photography is the opposite. Shadows add greatly to the mood and richness of the image, and shooting and/or processing to the left greatly enhances color richness. Shooting to the right, or overexposing, and then bringing it back in PP starts with dull colors. Shooting to the left, or underexposing, starts with rich colors. Just -1/3 stop makes a considerable difference with some cameras, while more is needed on other models. On the same scene with a tripod, mirror-up function, try bracketing exposure in AV, then without any color manipulation in PP compare them full screen on your computer to see the difference in color depth and richness.
While it is true that exposing to the right allows you to manipulate an image more in PP without introducing a lot of noise, while at the same time retaining more detail in the shadow areas, as long as you shoot at the lowest ISO possible, noise is not a problem. Besides, if you get it as close as possible at time of capture, you don't need to manipulate it as much in PP and risk introducing noise and artifacts. It is not just noise, but everything, that is better at lower ISOs, including color.
When you combine the richer color of lower ISOs with a slight underexposure to further enhance those colors, you begin with a rich image. Your shadows, of course, will be darker and lack detail, but I think that for landscapes, this is a good thing. Check out the way Ansel Adams and other masters utilized shadows. Doing this is even more important with color than with b/w, because color lacks contrast in comparison.
Various cameras expose differently. Those designed for higher ISO capabilities tend to overexpose a bit to begin. If your camera tends to overexpose in a plastic, product photography sort of way, you may need to underexpose a full stop to get what you want, so it is important to do some controlled tests and get to know your camera's exposure values well. At any rate, if you need to adjust exposure more than -1/3 stop in PP, you're not getting it right at time of capture.
Underexposing at time of capture also lets you capture a scene with a wide DR without blowing highlights. The image here was a very tricky exposure, and the DR range of my camera is not notably wide, but by underexposing it, I'm pleased with the look and colors. The first image is how it was shot. The second had the exposure adjusted down .18 in PP and the gama reduced one point.