I use alldebrid because my use case is slightly weird (I want to keep files in my debrid and stream them from it so I can have a big Jellyfin library without having much storage) and their retention is best.

Torbox is a newer to the market (less will be cached) with a couple of bonus features. My second hand impression of it is that it’s still in Beta (usable, but not free of bugs or stable). They seed the torrents you download.

Debridlink is less popular (less will be cached), but seems well liked. They also seed the torrents you download

Continuous.

Instead of jumping from 1 to 2 to 3, we move smoothly across all (typically real) numbers. Obviously this would go to infinity almost every time because there are infinite real numbers between any two distinct real numbers. So instead, we merge it into a bunch of skinny rectangles with their bottom on the x axis and the top at the value of the function for the start of the rectangle. As we shrink the width of the rectangles, it approaches the continuous notion.

Continuous means “smooth” - there are no jumps Discrete means there are jump