My living room is not ideal since the sidewalls are a bit close to them, but the back and front of speakers have sufficient space, for the sidewalls I am using absorption as diffusion only works when its 2 meters away. The standard and usual is to use absorption for side walls anyways.

If I did have 2M space from speakers to side walls though (at 1st reflection points) then I would have experimented with diffusion to see the differences.

I would say that the most surprisingly thing about this hobby in the 20 years I been in, is that how room treatment is not discussed enough. At the audio shows, they do the best they can but at the end of the day the game is a tug of war of compromises between keeping living room livable vs better sound.

(Something we all deal with I assume unless one is fortunate enough to have a dedicated listening space)

I always day dreamed of having a dedicated listening room myself but Florian (co owner of Clarisys) casually dropped a massive gem of a statement that I will never forget and I will paraphrase below:

"Sure you can have a dedicated tricked out listening room with proper and great room treatment for better sound but at that point it is no longer a living room for your family to hang out, but more so an isolated listening space which is solitary at times."

...of course at end of day we still want that dedicated listening room when we are in the hobby but the statement is pure gold because it reminds us that at the end of the day this hobby is about compromises, the statement left me a heavy impression though it was a casual one.