The selection of date pickers for a form depends on your purpose. For example, separate dropdowns to select the day, month, and year can require an unreasonable number of interactions for something like a birth date. This is to say that a plain text input is enough for data that people can type with their eyes closed. Just be sure to use an input mask, so users don't need to worry about typing in the wrong format.

For actions like booking a flight or making a reservation in a hotel, text inputs can be tedious. Commonly, a calendar date picker is a better option for letting users select a date that is close to the current date by no more than a year.