たいのかたち

I've got a question about this topic I was told that when I'm reporting what someone else says he wants I could do it like this 彼 は おかし を 欲しいが っています or like this 彼 は おかし が 欲しいといいました My teacher told us that the first one should be avoided since is like you are throwing a tantrum but lately we've been using it to answer during class , so I'm confused. Is it really a childish way to say you want something or is it normal? Which one is better? Thanks in advance