Most times when a string breaks it is one of the main strings. This is due to the higher load the main strings are under during play. Hybrids help solve this problem by using a more durable string for them mains such as Kevlar or polyester, and then using a softer string for the crosses. This setup allows for a durable string set without sacrificing feel and touch. A durability string used all the way around in a racquet will likely feel stiff and unresponsive, but used as a hybrid it will like play much better.
Reverse Hybrid uses softer string in the mains and harder string in the crosses to get more spin than regular hybrid. Reverse Hybrid has low durability. (Roger Federer setup)
From Ace String Service..
so if money is no object use a reverse hybrid.