She revived them both as a sense of duty, either to repay their kindness or to make up for past mistakes. Vriska is a lot more honor bound when you think about it.
And yeah, Equius is probably totes more happier like this
Ok, yeah. It was weird when Gamzee did it, but you can attribute that to the highness that he had. With Vriska doing it, that makes it a bit more terrifying because you know she has plans.
Did Vriska revive Equius for shits and giggles? Because unless she happened to see Caliborn’s vines with her Time Toys, I would like to put out the idea she revived him for shits and giggles.