When something's very close to you, it looks bigger than when it's far away. Putting it in a less obvious form, relative sizes are determined by relative distances, and are controlled by your camera position. Distance controls the perspective and how a scene appears; the focal length of the lens controls the angle of view.
Use an extreme wide angle, and you go in close and nearby objects become larger in the frame.
If you start with the lens, you've already effectively ruled out a lot of ways of composiing the scene. Better to decide why you want to photograph it, what the best position is to achieve the effect you want, and only then choose the lens. For what it's worth, most of my landscapes are made with the standard focal length for the format; my next most common focal length is slightly longer. Wide angles don't get much of a look in, But this is down to the way I see; others see things differently.
If you want to copy what seems to be the current fad, you probably need a wide angle. But better (in my opinion) to look carefully and decide how you want to portray the landscape. Take a look at some photographs and crop them down to see how the mood can be changed by simple elimination (such as would be achieved with a longer lens). Then work out how you "see" things, and how you want to make them appear to others.