The main difference is that they are joined up. Usually, you have the same teacher (whose philosophy is upfront in this website). Also, you have fellow class members. However, some are ahead of you when you join yoga, then after . You are joining a small community of local parents-to-be. Therefore, you get to know them much better than in stand-alone couples classes or hypno-birthing classes.
Also the learning is hands on, with a chance to practice for many weeks. Not just a few classes or a weekend. It gets repeated to become second nature. It eliminates the need for scripts or homework or scary information you can’t take in all at once. Finally, most other classes end at the birth. However, mine offer ongoing guidance with a structured postnatal group and baby yoga as part of the package.