First of all, from the beginning, the piano was better than the saxophone, because the piano only needs to be played by hand, while the saxophone needs to use both hands and mouth. Moreover, saxophone is a stringed instrument, which requires high breathing, so it is a little more difficult than piano.
Secondly, in terms of professional difficulty, saxophone is easy to learn, and the professional difficulty of piano is much greater than saxophone, because piano is called the king of musical instruments after all, and it requires higher coordination of fingers. It is easy for beginners, and the more difficult it is, the more difficult it is, and it needs to practice speed, strength and flexibility every day, otherwise the strength of fingers will be weakened, while saxophone is a monophonic instrument, and the professional difficulty is not high.
In short, if you are just interested, it would be better to choose the piano. If you want to acquire a professional instrument skill, saxophone will be more in line with the requirements. Both have their advantages and disadvantages. Of course, you should also consider your own preferences when choosing, because interest is the best teacher, and it is difficult to stick to it without interest.