There are several external monitor control apps on macOS — some paid, some free. One thing I can say for sure is that not all features are overlapping with each other. It’s easy to imagine have one universal app fixing all the monitor needs, but I found out different apps focus on different areas. My focus were primarily the following:

• More convenient HDR settings
• More convenient refresh settings
• Automatically disable built-in screen for Clamshell-like mode
• DCC support, if possible
  

BetterDisplay, priced at $19.99 for Pro version, does meet most of my needs. Quick reminder, after trying out the free version, I am more inclined to suggest using other apps if the price point of the app is an issue. Many must-have features are locked behind the Pro license, and the license itself is strictly controlled in old-fashioned way. I wouldn’t put it under as a con, but having to unregister and re-register to a new Mac manually because the licensing system can’t handle it is not an excuse for inconvenience in this day and age.

The app does give me more advanced controls and ease of access of monitor settings. In fact, one annoying tendencies with Thunderbolt displays is that it automatically falls back to SDR whenever there was a disconnect — BetterDisplay can keep the setting secured. As for the DCC, while it supports brightness and others, volume keys weren’t working with Dell u2725qe. The app doesn’t make it apparent; in fact, I had to disable the volume keys manually afterward.

Irregardless of minute issues I have, this is an active development, as far as I can see. The app is still receiving new updates, and it works well with Apple Silicon. In fact, many of the features only work on Apple Silicon. I was pleasantly surprised to find out my M2 MacBook Air was capable of pushing 4K external display — something I needed an eGPU with Intel Macs.