I would recommend only downloading the 1080p clips which has the added benefit of saving you disk space over the higher resolutions.
This would also be my Recommendation.
Download the Resolution that Best Fits on your Screen.
While you can use 3K and 4K clips on a smaller screen
every single frame must be Scaled Down to fit the smaller screen
This uses quite a bit of CPU performance to do this.
If you screen is less than 19 inches in Physical Size.
I doubt you would notice any difference from using the Higher resolution clips.
If you use a screen between 20 and 60 inches,
then you might see a little difference by using 3K clips on a 1080p screen.
Also, If down the road you get a PC or Laptop with a higher resolution Screen
( 4K on smaller than 20" to me is not logical )
The Higher resolution clips can be downloaded when needed.