I mean everyone has different opinions on preference, but clearly from a technical stand point ori is taking it to the next level, and is hand drawn as well, it's something that will impress people way more then hallow knight, its clearly has a bigger budget. I did watch a lengthy video, and its not even close imo.
Each to their own - we agree that Ori has a much bigger budget - I guess I personally place more emphasis on the uniqueness of the art and visual design and how it feeds into the overall atmosphere and experience. I really enjoyed Ori but it felt like a big studio game with all of the hard edges knocked knocked off of it and the art style is one I feel like I've played and scene before (albeit more beautifully executed). Inside was another 2D game that I loved for it's distinctive use of stark lighting and stripped back palette.
I'm a graphic designer so I think in general I gravitate more towards more unique takes on aesthetics over ever more sophisticated versions of more conventional styles. Though as I say, I still enjoyed and appreciated Ori.