Yup, budget?
For the two lenses you mentioned, the 100mm and 105mm lengths are essentially the exact same lens (functionally), just different brands. Something else to consider...
Using Canon as an example (but mostly applies to Nikon too), there are several different "lengths" that can be used as macro lenses. For example, Canon has macro lenses in these lengths: 50mm, 60mm, 100mm, and 180mm. The bigger the number, the more "working distance" you have between you and the subject when it's magnified to its max. More working distance is often a good thing, and with things that get spooked or bite, it could be essential. However, the bigger numbers have a more constricted or narrow angle of view (side-to-side). Any of these four lenses can be used as "normal" lenses too. The one lens that
@Overread mentioned above (65mm MPE) cannot be used for anything BUT macro.
From personal experience with all of these lenses, my favorite on a crop-sensor camera (more likely that you'd get) is around the 60mm range. But, that 100mm with IS from Canon is pretty sweet. I would not recommend the 65mm MPE, nor the 180mm as a first macro lens.
For landscape work, most people prefer a wide angle or short lens. (You *can* use a longer lens, but that's a different style of photography.) Most people enjoy a lens that is shorter than the 18mm kit lens. Personally, one of my old favorites was the 10-22mm (or 10-18mm). But any number range that's close to those numbers will likely do well.
As you get closer to a decision (and budget), the choices will become more clear.