best poker player type to target if you want to exploit weaknesses

Been watching more poker tables than I actually play lately and I keep noticing certain players just bleed value all night, but it isn’t always the obvious loose guys. I get the obvious limpers and maniacs are targets, but sometimes the real gold comes from the folks who play “by the book” a little too strictly. They stick to some ABC style, never bluff, never adapt, and you can almost set your watch by their ranges and bet sizes. Other times, the scared money is just sitting there - players who are sweating every pot, check-calling their stacks down like it’s their rent money.

Figuring out which one to zero in on for real consistent profits is starting to feel more like my roulette grind - finding those little hesitations and tells, the predictable cadence, the same old spin. Curious what folks think is the best type to focus on.