I've also noticed that you can differentiate VNs based on what sort of consequences your choices have. In some VNs nothing changes based on your choices (or very little, like whose H-scene you get at the end (looking at you, ML:U), in some VNs all of the changes are direct consequences of your choices (Katawa Shoujo is a good example, the only difference between the routes is who you spent/spend the most time with), and VNs where your choices affect which route you'll get, but not in a way that would make much sense outside of a VN environment (the first one that comes to mind is FS/N, pretty sure Shirou's actions aren't what cause Heavens Feel to happen instead of Unlimited Blade Works, though I may be mistaken).