i have about 70 native DXD (24/352) master files, and 50 native 4xdsd (Quad dsd) files. my dac is bit perfect, and uses hybrid dac chips that are equally optimal for PCM and DSD.
from what i hear in my system with my dac, i do prefer the native DXD as consistently slightly more textured and vivid. but i would say that the individual mastering and recording approach is as significant as the difference between those 2 digital formats. many of these start out conceptually as multi-channel recordings, with a 2 channel version. it's just the approach these particular labels are taking. so that is a factor in trying to determine preference.
the one native 4xdsd recording i really like most is a pure 2 channel native recording, not multi-channel. do i prefer it because of it's recording set-up?
so ultimately the data base is maybe too limited to really say definitively.
many 4xdsd recordings you might find are actually native DXD; on those i clearly prefer the native DXD. but when mastered from tape; i'd say DXD and 4xdsd are more equal. OTOH my most 'wow' digital demo cuts are DXD mastered from tape. simply breathtaking.....likely more the quality of the music and source tape than a format issue.
lastly; if we had to choose one or the other going forward it would be DXD for me. mostly since it folds down neatly into 176/24 or 88/24 better than 4xdsd.
here is a website i have downloaded many of my DXD and 4xdsd files from;
https://www.spiritofturtle.com/?v=796834e7a283
there are other such websites. there are also a few 8xdsd files out there to download; but i have not yet dipped my toe into any of those.