Here are the official explanations and their translation to the general effect:
collisionflags Move(Vector3 motion);Description
A more complex move function taking absolute movement deltas.
Attempts motion
to move the controller by, the motion would only is constrained by collisions. It'll slide along colliders. Collisionflags is the summary of collisions that occurred during the Move. This function does does apply any gravity.
Character movement is constrained only by collisions. The character will slide along the collision box when it encounters a collision (you know). The return value is a summary of the collision information encountered during the move. The move function does not use gravity.
bool simplemove(Vector3 speed);Description
Moves the character with speed
.
Velocity along the y-axis is ignored. METERS/S Gravity is automatically applied. Returns If the character is grounded. It's recommended that's the one call to Move or Simplemove per frame.
the speed of the y-axis will be ignored. The speed unit is meters per second. Gravity automatically takes effect. The return value is whether the role is on the ground. It is recommended to call a move or simplemove per frame
[Unity-16] The difference between the Character controller's move and the Simplemove