The number of weapons you have to keep ready for nightfall is what makes it tough. Solar, Void and Arc damage are all important, depending on which strike the current nightfall is. It's truly a game of rock, paper, scissors. VoG on the other hand is all void damage. When the new raid comes out, it will probably be all about solar. The fact that the nightfall puts you back into orbit makes it much more tedious than VoG is. Take a couple hours one day and find a group; you'll get through VoG pretty easily.