Portable O2 bottles and the drop down masks are not recommended for fume/smoke events by any manufacturer that I am aware of, portable O2 bottles have the same limitations, and using one may convince a crew member to enter or remain in an environment in the belief that they are safe, when in fact they are not.
All the airlines that I have flown for recommended the smoke hoods for both fire fighting and dealing with dangerous goods fume events (as the hood works, while the bottle doesn't).