portfolio

hi guys, for portfolio/writeups or showcase your skill which platform you use
i'm confusedin github, gitbook and medium

medium is like blogging

i saw a guy's gitbook writeup profile and it's so clean and well maintain
but when i asked Chatgpt it says to upload your writeups to github only as it's more professional and best for cybersecurity portfolio

does it really affect if i use gitbook instead of github?