Probably either the Odroid N2 or HC2 or Nano Pi M4.
The one feature all these boards have in common is their CPU is mounted on the _bottom_ of the board, allowing a much larger heat sink to be mounted without obstructing anything. The lack of this feature in on the RPi 4 is a fatal blunder IMHO and why I chose not to buy it.
I currently use a Nano Pi M4 as my main desktop computer. It has no active cooling, only a big heatsink which covers the entire rear of the board. As I write this, I have three browser windows open containing a total of 30 tabs while streaming a 44 kHz stereo 128 kbps audio stream. Its CPU temp is holding at 32 C.