How to correctly calculate vectors for a camera in 3d?

Question

3D

By default, the forward vector for Euler angles is calculated:

x = cos(yaw)*cos(pitch)
y = sin(yaw)*cos(pitch)
z = sin(pitch)

But in one of the guides I found another view:

front.x = cos(glm::radians(Yaw)) * cos(glm::radians(Pitch));
front.y = sin(glm::radians(Pitch));
front.z = sin(glm::radians(Yaw)) * cos(glm::radians(Pitch));

Which implementation is better and why?