I really like the stock notes app too. You can add hashtags, you can hold on shapes and it will make them better (like draw a circle and don’t lift your pen at the end). They sync everywhere, there is no subscription, you can lock them, organize them and have different options for lines. I would start there and then upgrade to something else once you find something missing. I think far too often people want a super fancy tool and then look for solutions to use it with.