Some wall of text impressions of the XDR vs OLED:
I'm a programmer that's very picky about displays. I have near sightedness and an astigmatism corrected with contact lenses.
I've been using an LG 32GS95UE 32" OLED for the past 6 months. I LOVE the deep blacks and high refresh rate, and it has a very stunning picture. The problem is every single night after working on my OLED I would end the day with super fatigued and bloodshot eyes and I had a hard time even focusing on things, to the point that I wouldn't even be able to read subtitles on the TV or read a book. I tried everything to fix it including making it dimmer, disabling dithering, reducing refresh rate, reduced contrast, different office lighting, taking endless breaks, and nothing helped. Also the constant bother of doing things to avoid burn-in as a programmer is very inconvenient.
I have never had the same eye issues with my MacBook Pro 2023 screen, so I've been waiting for Apple to release something that was basically the MacBook Pro screen but larger. Refresh rate and black level are both very important to me so the regular Studio Display was out. I jumped on the XDR even though it is quite pricey for me. I know LG/MSI are releasing ones with possibly the same panel but at this point I straight don't trust them to make something great with it.
The XDR absolutely blows the OLED away in most ways for me. It's FAR crisper for text even when using scaling due to the higher PPI, glossy finish, and RGB pixel arrangement. The colors are better, the HDR is much more noticeable, and it's more pleasing in general to look at for hours. The viewing angles are great, and I see basically 0 IPS glow (I owned a few 4K IPS displays before the OLED and they were terrible for glow). The viewing angle color shift is a little worse on the vertical than the horizontal if that bothers you. The screen uniformity is basically perfect on mine, certainly compared to OLED. There is some slight vignetting, but nothing like the old iMac displays though.
I have also been streaming Resident Evil Requiem from my gaming PC to it and it's been great in that too. I will say it's a little silly that my gaming PC is right there and I can't find a good way yet to really connect it to the XDR when I want to play games, so I'm just using Moonlight streaming to play it through my Mac ha. Moonlight supports the 5K/120hz/HDR perfectly though and the motion is more than good enough for the games I play. I'm guessing hardcore multiplayer FPS gamers would be happier with the 240hz OLED though. To my eyes the motion looks far better than my MacBook Pro 2023 screen.
If blooming isn't an issue to you on the MacBook screen it won't be here, I would say it's very minimal. However I don't use my monitors with super bright settings, usually in the 45-55 range, so maybe it's worse if you'd running super bright video. I tested a bunch of HDR videos on YouTube and personally the minimal blooming is a fine compromise for all the benefits over OLED.
Best of all thus far my eyes aren't killing me after using it for hours, they would already be in massive pain on the OLED monitor.
The stand is awesome, I've never been a big fan of monitor arms. Note that it doesn't have rotation though, which is a big downside for me.
Also for anyone that can't get to an Apple Store to compare: I would say the nanotexture looked very sparkly/grainy on white content, and the blacks looked a little raised. It may just be the bright lighting in the Apple Store, but I don't think I'd go for that option unless you REALLY need it. It definitely makes the picture worse even though it's really good at reducing reflections. I decided to just get some black out curtains myself.
