Collars are needed for cat identification and are not necessary if your cat is microchipped. In my experience flea collars are a total waste of time. Any collar should have a safety measure that allows the cat to wriggle free if it becomes snagged and caught on an object. A reflective collar can be handy for locating your cat at night. A collar with a bell on it might save the lives of a few small birds with the added benefit of alerting you to the cat at night when you go out looking for it
Only use this if your cat is microchipped
There are millions of different types of collars and they can be easily made individual.