[ramblerman]

Do you have some evidence that this particular algorithm is so effective?

I have some doubts that there is a 'perfect' forgetting curve that maps over all items equally that this would matter to such a degree.

I.e. if it comes back after 3 days then 9 in Anki, or 2 days and 10 in SM18.

What matters is showing up and spending the time with your SR tool, as well as adding high quality cards.