An example of a yoga posture that may have been adapted for Pilates is the elephant. The elephant is done on the reformer, a specialized piece of Pilates equipment, and looks a lot like Downward Facing Dog pose. Although the elephant takes place in the same position as Down Dog, it feels quite different while you are performing it; done correctly it releases tension in the low back, increases awareness of the shoulder girdle, and can get you to walk away with very sore abdominal muscles.
That is not to say yoga does not strengthen core posture muscles. But working the core is a key primary intention of Pilates, while in yoga it is one of a number of benefits. Both systems will increase flexibility, strength, balance and coordination. Both can be helpful in reducing or preventing back or neck pain. It may come down to personal preference, as quite often yoga provides the opportunity for a spiritual experience, while Pilates stays mainly in the physical realm.
Source:
What is Pilates? Pilates Method Alliance website. last update: Dec. 2007.

