I would absolutely go with the second option. Talking to a friend about some investment opportunity is one thing, actually convincing him into buying something is a totally different thing. And if for any reason he changes his mind and he needs the money and he's at loss, well, guess who's going to blame. I told some of my friends about bitcoin years ago, mainly because I found it very interesting and I thought it would be to share it with them but I never told them to follow me.