"buy first bitcoin" sounds kind of wrong, not an english expert but seems like something's missing.
Maybe "buy your first Bitcoin" would be better, as for your question the middle one looks best imo.
Also and I realize you're not the only one doing this mistake and it may be easy to misunderstand. The community is more about thought-provoking questions that raise engagement.
Think like "what is something you will never like even though many others do"? instead of "which of this specific things I'm already bringing forward do you prefer".
oh okay so not like a hive-mind. will rewmember