i began meditating doing zazen, studying zen and taoism. i later became enamored with theravada, because of its ancient buddhism flavor and its seemingly more straightforward meditation instructions. i got caught up in all of the intellectual arguments that set samatha and vipassana against each other, or if they were developed in tandem yada yada yada. i came to realize my attachment to concepts was the cause of my prefering this type of meditation and discussion. it is based on trying to fit words to what happens during meditation and this really is not possible.
so i am back to zazen, and i think i appreciate it more after my excursion into samatha and vipassan, and i have to say, i believe all buddhist teaching and meditation reaches its culmination in zazen. maintaining the posture strengthens mindfulness, creating m a situation where you have to maintain mindfulness of the body, all the while observing and letting go of whatever arises in the four frames of reference and the five sense doors. this being aware of whatever arises leads to insight while letting go leads to samatha.
so i feel that all of the arguments are solved and all requirements are met by just sitting. instead of trying to follow some method, which leads to thoughts of "am i doing this or that right", you just sit and let it all go.