Monitor for new M4 Mac mini

Please explain:

  1. What “scaling” is and then
  2. Why scaling 5K over 27” is better than scaling 4K over the same sized monitor.

I have an iMac (Retina 5K, 27-inch, Late 2015) that is stuck at macOS 12 Monterey and it’d like to replace it with an M4 Mac mini.

I’ve put this off for a long time because i was hoping that Apple would release a bigger iMac, in part because I’m really intimidated by choosing a monitor.

For what it’s worth, I also have an 2022 M2 MacBook Air.

Thank you.

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