[@Kronshi]

The person that reverses time can only go back a few hours at most. 
Time Loop can redo a whole day
Slowing down time lasts longer than the Person who can stop time

The person that stops time has the down fall of having to hold time back so it makes it harder to keep it going long.
Slowing down time means there is still a flow so they can hold it longer with more ease with out the harsh downfalls happening quicker

The last two I am not sure about myself which is why I am just adding them for now. I told you this is a very very rough idea.