Which brand of digital perpetual calendar is the best

With the increasing number of digital calendar manufacturers, it is becoming more and more difficult to purchase digital calendars. However, the popular brands of digital calendars are as follows:

I. Polaris digital perpetual calendar

Second, Tian Li and digital calendars

Third, Gidron digital calendar.

Fourth, Combas digital calendar

The brand of digital calendar is not the best, as long as it is suitable.