Sorry, I cant tell the difference @ 144 samples.
With Out Portal:
With portal:
He does state in the videos, that when he did the test later it seemed to not make much of a difference either.
I try and do the challenges as issued and then watch the solution to get maximum blender gains.
Same. I did three differently portaged renders and they all looked the same.
Was the render time the same or faster with portals?
A little slower, and the quality still wasn’t that much better.