Which style of Qigong is best? Is there a best style of Qigong?
There are hundreds of different Qigong styles and systems. Some very old, some not so old and some new. Most have value. There are a few newer styles that seem to have been developed just for the profit motive, but there is value in all styles that have old roots.
The way Chinese medicine works is based on the fact that we are all individuals, and what works for me might not work for you, even though the symptoms we display might appear to be identical.
Practicing the oldest forms should be beneficial to almost everyone, the Five Animals and the Eight Section Brocade are the best known. If you have a specific health problem, or are looking for the best forms for you as an individual, you should seek out a person knowledgeable in Chinese Traditional Medicine and the theories it is based on.
Once you have the correct diagnosis or recommendation, you can proceed from there.