My answer to your question is twofold.
1. If you do exams, you CANNOT use a 415Hz recorder, so you need to have at least one 440Hz one
2. Are you playing with anyone else?
If you are playing on your own, it does not matter what the recorder is pitched at.
If you play with someone else, either reocrder consort or other baroque instruments such as a harpsichord, you need to be able to be in tune with them. So if you are playing with others you need to find out what they are playing on first.