I’ve always been taught the two rooks are better and who can argue with 5 + 5 > 9? But also, I’ve also lost almost every game where I’ve had the rooks. I always thought that I just needed to be a better player to take advantage of it. Glad to know it wasn’t just me.
Just goes to show that these shortcuts, like the point system, are only heuristics, and pretty shallow ones at that. Knowing that being up a bishop gives you slightly more of an advantage than a knight is better than nothing. But learning in which sorts of positions a knight is actually better than a bishop will give you a much deeper understanding (and correspondingly more wins).