The release of the Xiaomi Mi Band 4 is imminent, according to an executive with inside info. However, it’s not likely to land in the next few months. Source: Xiaomi Mi Band 4 will arrive this year, but probably not in next few months
Good review of the Amazfit Cor. It’s in Italian so use Google Translate to read. Source: Amazfit Cor officially supports English with Xiaomi Mi Fit 3.2.2.2 – All Android