From my point of view it s dificult to compare Tai Chi and Yoga.

Tai Chi is a mind-body exercise originating from ancient China, where it started as a famous martial art. These days, it’s practised around the world as an effective exercise for health. At the heart of it, Tai Chi is a moving meditation in the form of a series of gentle exercises that create harmony between the mind and body. The ultimate purpose is to cultivate our inner life energy (qi) to flow smoothly and powerfully through the body. This is a spiritual experience, as much as a physical one.

The word yoga is derived from the Sanskrit root yuj, meaning “to yoke,” or “to unite”. The practice aims to create union between body, mind and spirit, as well as between the individual self and universal consciousness. Such a union tends to neutralize ego-driven thoughts and behaviours, creating a sense of spiritual awakening. Modern yoga is most commonly associated with the physical practice of asana, a series of postures.