"Hmmm, what would you recommend?" Easy question. It's just your opinion but you know the old adage, everyone's got one. Don't answer it! It's a set-up! Fine, go ahead, everyone does but guaranteed, it's the kiss of death. If you want someone to choose the one you want then recommend the opposite.
When I was in high-school I worked at the local theater. I loved that job! As I moved up the ranks from lowly concession worker to the pinnacle of success as the "Head Cashier" I also took on the responsibility of recommending and giving my opinion to the average movie goer.
Mistake #1: Thinking that they value my opinion.
Mistake #2: Thinking that they would like the same type of movie that I enjoyed.
Mistake #3: Taking it personally when they invariably chose the "other" movie.
I think this goes for books as well. There are "those books". The ones that we connect to on some deep and personal level. We wonder how that author knew that we had felt that same emotion at some point and how in the world were they able to express it so simply when it was so complex. I enjoy seeking out and "discovering" my next most favoritist book but I would be less likely to put that same book on my favorite list if it was told to me by someone else first, that it was an excellent book. I think it all comes down to ownership. I am not able to own something to the same degree if someone "gives" it to me. I want to seek it out, find it, and then take it or leave it. It's my choice and I own it!
"It's choice - not chance - that determines your destiny." -- Jean Nidetch”