MP4 is the container. It will help to know what codec is embedded.
But at this distance and based on what you have said, I would give them as close to the camera original as you can.
Assuming you have done some NLE editing of copies of the camera originals and assuming that in your NLE, you have changed nothing as far as the format is concerned
(and these are major assumptions which may well be incorrect), I would export from your NLE into exactly the same format, bitrate, codec, frame rate as the camera original. IOW all the NLE has to do is make a copy of the footage with adjusted In & Out points.
If however the NLE has re-encoded, 'optimized' or done any work at all on the footage other than i/o points, you will need to tell me what codec etc was originally used and what the NLE format is. Generally a camera recorded original contains compression which is 'expanded' or optimized for editing in the NLE. On a Mac I generally go from H264 420 original to ProRes 422 for editing/colour correction and then back to an H264 encoded (compressed) final.
Short form: there really is not a simple answer