I have to say they are both good! The functions are very complete, all kinds of modes are compatible. The dials and straps are great! But if I have to make the only choice, I will always choose Apple Watch!
Battery life: Apple Watch SE needs to be charged once a day, and Xiaomi recharges every three weeks.
Function: Appel Watch SE can reply to text messages, a bit of basic operation. Xiaomi Band can also watch messages but can’t reply, because it’s a bracelet.
But the display effect of the Apple Watch is better.
Health function: Still testing, I skipped rope yesterday, and the heart rate and fat burning measured with two devices were almost the same. It’s just that I feel that Xiaomi Band is too long to wear.
Both of these are great! If you have enough budget, you can buy Apple Watch. If you have a smaller budget, Mi 6 is also very good! Probably, it’s the feeling of Uniqlo trench coat and Burberry trench coat. They are all coats, they all look good, but I still want to choose Burberry coats, LOL.
Jason 
Molly A 
James Chow 