Giggs was in charge of only four games, winning his first 4-0.
Vidic told the Telegraph: "I am not saying that the David Moyes way was bad, but these players feel more comfortable playing a certain way of football.
"Ryan [Giggs] shares the same ideas as Sir Alex Ferguson and his was a more similar approach to the one we had with Sir Alex [Ferguson]. The players are more used to it and felt more comfortable with it.
"The best answer I can say is that he [Moyes] tried really hard, he was professional.
"He was really committed to the job and desperately wanted to do well. But unfortunately, it didn't happen and we are all sad."
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