Resizing a resized image | is 4k to 720p better than 4k to 1080p to 720p?

[natanzz]

I frequently resize a 4K image twice because I need both the 1080p and 720p versions.

If I resize a 4K image to 1080p, and then resize that to 720p, will I get the same quality as when resizing from 4K directly to 720p?

Or would it be better to undo the resize (back to 4K) and then resize that to 720p?

[Bojan Živković]

If you resize (scale down) twice then you are running scaling algorythm twice. Compare on your own. Theoretically (and practically) fewer resampling processes is better.