Use EVERY TOOL at your disposal. Every situation is different. Shooting from a rest is obviously advantageous but not always available OR practical. That's when your skill level and your target size, distance come into play. One should always go for the steadier position, but again it's not always practical or available:

60 yards off hand:[Linked Image from i.imgur.com]

330 off shooting sticks:
[Linked Image from i.imgur.com]

A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”