On line display of an image, can be affected by the method of delivery. You're at the mercy of the provider. How often do we hear that the images aren't displayed correctly on Flickr etc. What size is best for your image to be displayed and has the viewer a monitor capable of that resolution?
Because of unauthorised copying, use, images tend to be small in nature or watermarked. The advantage is it's easy to share quickly to many people. For the wedding I recently shot, the majority of the images were shared on line in a protected folder as many of the family and friends travelled far for the wedding and wouldn't be around to see the album.
The album when finished was something different, something tangible to savour, handle, to discuss and share over tea, a much more sociable method of image delivery.
With print, aside from quality, depths of tones, you have a choice of medium, which makes a big difference. Matt or gloss, choice of paper type or medium (acrylic, aluminium, canvas, t-shirt etc), texture, size, how you present it. You can modify the final result, I saw some beautiful work by a Taiwan artist, Kamolpan Chotvichai, who cuts her prints into fine ribbons, the depth and impression is lost when seen as a 2D representation. Wu Tien-Chang beloved was presented in Venice with enormous, impressive lightboxes.
With a physical copy, you have much more control over the final image and the way its displayed, but for the majority it's likely to be to a smaller audience.
Distribution of an image is for a reason - unless it's icloud auto copying your phone images for others to see

The method of distribution is relevant to the final audience requirements, but when asked
What are the major differences (if any) in your opinion and experience, to say that
ones on paper, the other's on a screen... that's about it, as a response shows a lack of understanding.
I don't suggest it's appropriate for all, but for that special image, print it occasionally, see the difference. For event's. special occaisions, family holidays, produce a book or album, put it on the book shelf and look at it randomly. The images, the collection, takes on another meaning than a collection on a screen.