Having tried both setups I found 8k 55" to be problematic. At 200% scaling it's like 4 4k 27.5" displays which are already a bit under scales individually (160 dpi equivalent being displayed as normal) but much worse because you need to fit 4 within your vision on a flat plane. At 250% things are better but now you're effectively just got an extremely large 5k display with all of the troubles/inneficiencies of fractional scaling.

I found stacking 27"-32" sized displays in a 3x1 or 3x2 to be much more effective. This allows you to adjust the angles horizontally and vertically to where you sit so it's less of a flat plane and allows you to pick 1440p or 2160p panels for each (depending on size you went with and money you want to spend) giving you the option to build to the size and resolution you want instead of the size and resolution you can fit using a single tv. For less than $2k you can get 6x 1440p@165hz displays and 3 dual height monitor stands so it also gives more bang for the buck. Well getting the same peak HDR brightness might cost you more, especially if you want that on all displays.

Not to mention 8k TVs try to do everything I their power to make the experience of just turning on and displaying the content directly and correctly impossible to do fully.

I tried a 49" 4k, and it gave me neck pains unless I only used the middle half of it.

Having had dual 5Ks for the past five years, I probably wouldn’t be excited even with it being 2x 4K. The bezels aren’t big enough to warrant the drop in resolution for something like this to me.