Yoga or tai chi?
Consider the potential practitioner: A fitness-challenged, ungraceful middle-aged person without access to a flesh-and-blood teacher, who will be dependent upon DVDs for guidance.
Yoga: Pros: A vast array of instruction materials; recommendations from friends and coworkers; the relaxation angle. Cons: I'm fat and inflexible.
Tai chi: Pros: Seems at face value to be a more accessible discipline; don't have to do floor exercises; looks cool. Cons: There don't seem to be as many instructional resources; when I attempted to teach myself tai chi using a DVD for older adults, it was still too fast for me to keep up -- which tells you something about my kinetic aptitude.
Those of you with experience in either or both practices -- what do you recommend?