Here is a good read from Albany, CA. The city just passed an ordinance making photoelectric smoke detectors mandatory in new construction.
This is a huge step and you should take some time to do some research about the pros and cons for each type of detector.
Real quick, photoelectric detectors are more conducive for smoldering fires; lot’s of smoke, and ionization are quicker to detect visible flame. The argument is that most people die in fires from smoke, not flame and the photoelectric picks up smoke faster than the flame is recognized using an ionization detector.
This has become huge in on campus housing.
Here is the link: Albany, CA Smoke Detector Ordinance