It really depends on what you're looking for. There's no easy answer really. It's like somebody asking for a book recommendation? Ok, but I don't know what that person likes. I also don't know how much time he's willing to invest in one.
Do you want a massive intricate love story that will remain with you for a long time? Try White Album 2.
Do you want to cry your eyeballs out? Try Kana Okaeri.
Do you want a slice of life story with cute waifus? Try Friend To Lover or Making Lovers.
Do you want a fucked up love triangle with animation and tons of choices? Try School Days.
Do you want a fantasy epic that centers around massive mammaries? Try the Funbag Fantasy series.
Do you want femdom? Try the Nope Nope Nurses series.
Do you want a mix between VN and RPG? Try the Rance series.
Do you want fucked up fetishes and hardcore sex? Try Armored Knight Iris or Space Pirate Sara or any other Lilith game.