Whether full seat or knee patch breeches are the better choice for you, depends on your preferences and your riding requirements. While good full seat breeches gives you stability at the knees as well as the thighs and seat area, knee patch breeches gives you more freedom of movement.
Especially in summer you will start sweating more easily with full seat breeches, but on cold days they offer more protection against cooling down. Which breeches are right for you also depends on your riding style. Due to a lot of movements in western disciplines for instance, full seat breeches are most suitable here. You will also benefit from the extra support in the saddle and the better protection of your seat when you are on trail rides and demanding rides.
For easy rides you need plenty of freedom of movement and therefore breeches with knee patches are the better choice. There is no general answer to this question, however, as riding tastes vary a lot. Some riders even swear that they prefer breeches without seat as they get along best with those.