"Who am I?" is a koan. I guess what strikes me these days is the common themes that I find between different traditions. All of the different traditions seem more like cultural wrapping paper.
Some of us are drawn to certain traditions and gurus for various reasons. As an example; as a teen ager in high school i spent years learning hatha yoga. l practiced so much that i did so at gym classes. While other students practiced traditional sports i was an anomaly to the gym teacher and a wierdo to many students. Yet i had a confidence in myself and what i was doing.
Later on i was attracted to meditation techniques that included a physical regimine. Yogananda created the energization spiritual exercises and Amma created the iam technique which both have physical exercises with a spiritual intent and are usually done before meditating.
As far as i know for example ; Marharshi Ramana and for instance ;Transcendetal Meditation do not include a physical routine and therefore are quite different in this sense. Many people do not look for a physical routine from a Master. They often find it elsewhere and come to recieve a meditation technique only. This one primary difference i see. Yet there are also others. Each according to his or her temperment and background.