You gotta choose one. A) Standing guard passes, ie: the bullfighter pass. B) Kneeling guard passes, ie: the double underhook guard pass. The pros for A is you can do it at any weight level to any weight level and be successful with it on just about anyone very soon. Very rewarding for n00bs. The cons are it leaves people (I've seen upper belts so lost without pant grips that they quit nogi after a couple of days) dependent on gi pants. Also, a sense of pressure and base isn't developed as quickly. The pros for B is if you are average size and you can use it well you can not only break down many submission attempts, but you can also secure pins and transition very easily because by the time you have semi-mastery you understand weight placement. The cons are it is very difficult to use on someone who is clearly better, or much heavier without a lot of practice, and you a mistake can get you subbed if your opponent is savy. If you are teaching, or if you are learning which one do you focus on. You have to choose one and only one and can't choose a combination of the two. Kneeslide passes count as kneeling passes. For the record, I pretty much Tozi pass everyone, so technically I use neither now.