I love reading, so of course i love read the manga first. Reading it first make me curious how the character sounds like. For me it's satisfying when the character you read make it to life haha.
I think different people might have different taste, but for me it doesn't matter if it's 2D or 3D. For me the most important part of otome games is what the story can you get and the character building, i like it if the character can resonate with me. If you love character that make you think...