They are both entirely different games. With that said, Fallout 4 will be MUCH more enjoyable. Less grinding, more adventure. I just see FO4 as FUN and Destiny as a tedious grind that I unfortunately got addicted to, somewhat, since well you know, since Destiny was built around human addiction and players obsession to obtain those super lootz. FO4 is about the journey AND the destination Destiny is about... Well, we really don't know cause they don't have time to explain.