This site does detailed reviews, including measurements, photos, and comparisons:

www.rtings.com/monitor
www.rtings.com/review-pipeline/monitor

They let votes determine which models to review next:

www.rtings.com/vote/monitor

This one is good for digging up details about specific models, such as what panel is used or where it was made, also with comparisons:

www.displayspecifications.com

Simon over at tftcentral used to do the best monitor reviews. Sadly, he shifted his site to an OLED-focused one a few years ago, and perhaps because serving gamers with disposable income makes more money. Nevertheless, he knows what he’s talking about when it comes to displays, his tech articles are still good (if you can find them on the new site), and he might still review IPS models once in a while:

tftcentral.co.uk

For me, IPS beats OLED, because:

1. OLED suffers from burn-in after some years. Some vocal gamers on Reddit don’t seem to care about this, arguing that you’ll throw away the monitor before the burn-in becomes a problem. I think this is irresponsible (unnecessary e-waste is awful), and wasteful (I keep using my tools until they die).
2. A good IPS panel will have only mild glow at off-angles. It’s visible around the corners if I’m playing very dark games and sitting very close to the screen, but even then, it’s never bothersome, since I don’t spend much time staring at the corners of the screen.
3. In addition to gaming, I spend lots of time reading text. IPS is generally great for this. OLED panels vary in this area, in some cases even using weird subpixel layouts (e.g. BGR) that defeat font rendering systems like ClearType, making the text anything but sharp. Eye strain sucks.

I haven’t been following display tech news in the past year or so, but when I was, LG.Display’s “IPS Black” panels were on their way to market with a promise of higher contrast ratios than traditional IPS. I think Dell or HP were going to use them. By now, more of their kind might exist.