Actually Elizabeth, what really got me started on the sorrowful mysteries, I read in one of those Catholic prophesy books, might have been Yves Dupont, that in the end times God will grant favors of those praying the sorrowful mysteries, not to say the others are wrong, but the way I understood this, God favored the sorrowful ones in the end times.
Of course He only grants things to anyone that are His Will also, no matter what they pray.
This made sense to me, because if we are, and I believe we are living in end times, and Jesus suffered for our salvation, and since we are getting closer, we should think about that more often, His passion.
Also during Mass the rosary prayed with the sorrowful mysteries is another way to pray the Mass. This I learned in Catholic school eons ago.