I am experimenting with both! I prefer using Substack personally to follow creators (I like reading long form posts there). I initially used it to share some writing I did, so decided to add the videos

I also have a YouTube channel and I may switch to sharing those links primarily, if people prefer watching there

https://youtu.be/XA7nMvgSZ7E?is=7m-bJreWnxAN08j-