It's good to be flexible in your own behavior. There nothing wrong with doing exercising that are opposing practices. You can practice one day being very direct and the next day being very indirect. There no conflict with learning both.

If you want to identify a good exercise I would look at the following characteristics:

1) First do no harm. If you analyse the exercise, do you believe that you have enough awareness of reading the girl with whom you are interacting with to know that you aren't doing harm. A minor awkward situation might be okay, but you don't want to create serious negative externalities for other people.

When doing that calculation you should consider that some girl might have been raped in the past and an action like slapping their butt might bring up the trauma.

2) Does the exercise feel like deliberate practice? Do you meet your own emotional barriers? A exercise might be too easy for one person and impossible to do for another. Seek exercises that provide you with a challenge but that aren't too hard.

3) There's a big difference between doing something and doing nothing. Even a suboptimal exercise is much better than devouring more theory.