no difference that you can see if you're using FM2. its more for program mode using the nikon FA or F501 cameras. I have the F501 and i can tell you i NEVER use program mode anyway. So effectively it doesnt mean a thing to you. Lens quality is still the same. If you use 105mm to take landscape you will get the telephoto compression effect in your images, unless you're taking landscapes very far away i dont suggest 105mm for landscapes.
My recommendations with respect focal length:
20mm, 24mm, 28mm - all suitable for landscape shots, with 28mm being the minimum. 28mm also versatile because you can use it to take candid shots.
35mm, 50mm - suitable for candid photography, snapping your friends etc. good for street photography too.
85mm, 105mm, and the less popular 135mm - all good for portraits, or taking inobtrusive street shots if you dont dare get closer. good for capturing landscape details if that is what you require. for example, that flower perched high up in the tree which you cant reach.
true telephoto lenses like 180mm, 200mm, 300mm are good for things like sports or birding or spying on people. dont really need it if youre on a budget.