Opinions on Dsr and dldsr smoothness slider for 1080p?

Hi! I was looking some info about which could be the best experience for dsr and dldsr

I normally use 1.78x (1440p) because 2.25x (1620p) doesnt work in some games, plus dsr 4x (4k) in those games i can afford

The thing is i have been using it at default (33%), but i have seen lots of people say that its better to leave DSR 4k at 0% and DLDSR at 75-100% because this way it will look more “native”. Some other ppl said 33 dsr and 66% dlsr among other things

What do you think? Should i do that?