Both are suitable. If you choose the best, fish is more suitable. The meat quality of fish is tender, which can be easily digested and absorbed by protein, but there is a disadvantage that the cooking process of fish is complicated and it is troublesome to eat. Chicken has a high protein content, especially chicken breast, which has a low fat content and is especially suitable for muscle training. Most people will choose chicken, which is easier to cook and eat, so the subject can choose according to his own situation.