In my opinion the problem with that is you spread yourself too thin and you become a jack of all trades master of none in regard to techniques. Somebody who practices time and time again just a couple of techniques, after thousands or millions of times doing those techniques they will have honed them to a level that would go far beyond what somebody who tries to practice all the techniques equally will ever get them at. Look at Muai Thai and how strong the low round kick is for professional Thai fighters. They have really strong low round kicks because they practice that one technique day in and day out.From my experience, there should be no favorite technique. I want to learn all techniques equally well. If I choose to focus, it will be on a technique I don't feel I have mastered.