Print To Video assumes that you are recording to a brand new tape that has not been recorded on. It automatically lays down a control track which is a series of pulses that allow the recorder to record and play back the audio and video correctly. If there is a break in the control track the recording will temporarily be distorted when the control track resumes. There is not signal recorded where there is not control track.
Edit To Tape assumes that the tape already has a control track recorded on it and attempts to read it when laying down the new video and audio signals. This is useful if you are updating a section of the tape.
Edit To Tape does give you the option of recording a new control track (Assemble Edit) or adding to a prerecorded tape (Insert Edit).
Hope this simplification helps.
Jim