Which is more accurate, solar calendar or lunar calendar?

Gregorian calendar is more accurate. If you follow the tradition of China, you should choose the lunar calendar, but you should know that your own Gregorian calendar has a birthday, because the Gregorian calendar is the basis for file registration, ID card and so on.

If the accuracy of calculating the birthday cycle is higher in the short term, then choose the solar calendar. Because the error of the solar calendar is only one day (365 days in a normal year and 366 days in a leap year), it takes 60 years for the lunar calendar to cycle accurately.