I found that rtings.com was the only site with enough detail to completely nerd out and find the right monitor.
My Dell - https://www.rtings.com/monitor/reviews/dell/ultrasharp-u2720...
My Apple - https://www.rtings.com/monitor/reviews/apple/studio-display
On the top level, the Dell is a better monitor overall, and even rated better for Office Use.
Then you scroll down to the brightness & reflections sub-scores and it's not even close. A+ Apple vs C to D- for Dell.
Every review you read will tell you how overpriced and mediocre the Apple monitor is. Then you go to a more detailed site like rtings & filter for high brightness & reflections ratings.. you don't end up with many other options. Pretty big gap in the market.
I encountered this when shopping for TVs - OLED can give you much better blacks while QLED can give you might brighter brights. So which tech you go with depends on if you have a bright sunny living room or a dark basement home theater. Do you watch TV during daylight all Saturday, or after dark weeknights night, etc?