Know your expertise. Know your own preferences.
If people told you to do stocks, of course because they know how to deal on it. Same scenario goes to bitcoin. Asked yourself what you really preferred and not just you will follow others. If possible, you can test both and see for yourself what's the best.
You just have to spend time learning on it and if you are really eager to know one of them.
OP since you ask this question, it means you don't have knowledge. At first learn what is stock market, what happend around bitcoin, then decide which one you can to manage well. In bitcoin trading you need luck too.