For 32 years I didn't have a hood on my +4 racer , so that was easy .... tonneau or nothing.
Now we have a hood on our +8 I still tend not to use it for parking overnight. Like Tim and Colin I prefer to use the tonneau and the storm cover. (and like JohnV6 I value it covering the louvres)
This does keep prying eyes away from the interior, which is not the case with the hood up.