“Nachher ist man immer schlauer.” 
Mine fell from a table once … not a scratch. It depends on so many factors what happens to a phone falling down … not the least luck.
If you expect a “rough” environment for a phone beforehand, you would have a point with looking at CAT’s line of phones.
Or you could protect the phone with an additional case, here’s a topic …
That would probably only replace the original case, meaning little or no additional protection, but for what it’s worth …