It just depends on the person. I'm mainly working with kids. I like higher reps on bench and lower reps on deadlifts. They tend to want to squirm a bunch on the bench at heavier weight. On deadlift, I've noticed form breakdown on higher rep sets. Squats is one that I'd typically prefer 5 or above at first too. It's not just the rep range though - # of sets, intensity, etc. People are acting as though it's really complicated when it's not at all. Yesterday my son was going to be doing 5 sets of 3 at a weight that I knew would be hard. After the first set, it was apparent he wasn't going to get all 5. Instead, we dropped weight back to what he started 5 sets of 3 at and he did 5 sets of 4. We'll probably run that through linear. Then when we get to the same weight where he wasn't going to get 5 sets of 3, I may drop it down to 3 sets of 3. These audibles are really easy to pull and literally have a PR (weight or volume) every single session.