Question / Help Base resolution or downscale?

[Fasthief]

Hello guys,
I wanna stream at 720p 60 fps, my in game res is 1280x720. Base monitor res 1080p.
What setting should I use? Base 720p or 1080p downscaled?

 

[Boildown]

1080p downscaled by 1.5. I think its better somehow than setting a lower base resolution.

 

[Siouf1]

1080p downscaled by 1.5. I think its better somehow than setting a lower base resolution.

Are u sure friend?

Im using desktop res 1080p and base resolution on OBS 1280x720.

Why downscale is better? ty