As a man who used to sell residential and commercial security doors and hardware......
Young kids in the house who might have to exit without you? Might be a reason to have a single keyed lock.
Other than that, you are probably better off with a double-keyed deadbolt on a door with relights. Just don't leave the key in the lock at night. Anywhere out of view of the window is ok, at one point I just dropped mine on the floor up tight to the jamb, no way to see it from outside and right there where I'd need it in a fire.
I kept a "formal" one hanging on a hook further inside for actually answering the door.
You do have a solid core wood or steel door right? Relight isn't just a big single pane but has some structure to it? Security film, double pane? Broken by steel or wood into multiple smaller panes?
