The OP article has a good focus on the more technical details, while the guide I linked above gives large lists of specific pens/refills compatible which each refill.
A list like that is not very useful because there is a wide variation in quality between refills of the same size. Better to find a comparison between refills of a given size, like this one for D1s.
The OP article has a good focus on the more technical details, while the guide I linked above gives large lists of specific pens/refills compatible which each refill.