When I add photos to my photo albums, can I automatically save the highest quality image

I decided that this called for doing research on my own - I found interesting things:

1. If I add a duplicate photo with a different level of definition , both copies are kept...Then I can check them and eliminate the lower quality one.
2. If I attempt to add a photo and it is already in the collection it is rejected and can not be added.
3. So I can take my chaotic collection, file them into albums and end up with nice clean lists..

I have a large collection - I need your suggestion. Currently I am moving copies from the general collection under photos into separate albums - there are many duplicates. Is there any way to automatically save the highest quality image in my album.

MY question is a practical one - not theoretical about the nature of Apple photos - What I want to do is to find and keep in my photos albums, the best copy of a photo out of several copies of the same photo in my collection. If I have a copy of a photo with 400 mb, and later I add a copy of the same photo with 450 mb. with the photo with the greater definition be kept and the other removed...?

If I am being vague - I apologize. Perhaps I am not phrasing my question properly. I have in my photo collection many redundant copies of the same photos, they vary in quality of definition. My goal is to find the highest definition copy is each and to store it in my albums. I was told by apple support that to was necessary to go through the collection and move them into the albums. When IO do this it does in fact eliminate all but one image of each type. Does the program save the photo with the best definition? If not is there a setting to make that happen. I may well be using incorrect terms - only because I don't fathom the intricacies of Photos... not because of purposeful user of vague terms.

These are exact copies of the same photos that are plaguing me - but with different definition... I have used Photos and iPhotos for years - and I have no idea how there copies of the exact same photo came into existence - The differ widely in quality. I have been using PowerPhotos and it is helpful - I have tried a multitude of settings in PowerPhotos but when it is finished I still find 4-6 copies of the exact same photos with different quality...It is exasperating! Mac Photos support has been of no help.

The question is - when I download multiple copies of the same photo to a Photos album - it generally only keeps one - what I want to know is this - does it automatically keep the highest quality photo? Is there a preference site where I can choose what. parameters I prefer?