I prefer Tokyo Dining. . We find it a slightly more sophisticated, quieter, relaxing place to eat. Teppan Edo is a typical hibatchi/teppanyaki type of restaurant, similar to those in any American city. We find it noisy, and crowded; just not our cup of sake.
ETA: The menu has changed significantly at Tokyo Dining in the last few years, so that it is primarily sushi now, but we would still prefer it to Teppan Edo.