Some hardware stats:
Looks like the Compute Modules are generally cooler than their counterparts. Also it seems like the trend is that new models are running hotter. Someone seems to cook their Pi 4 
| Model | Avg Temp | Median Temp | Min Temp | Max Temp |
|---|---|---|---|---|
| Pi CM4 | 41.9°C | 41.4°C | 31.6°C | 60.9°C |
| Pi CM3 | 43.4°C | 42.1°C | 38.1°C | 52.6°C |
| Pi 1B+ | 43.8°C | 43.8°C | 43.3°C | 44.4°C |
| Pi 3B | 47.4°C | 45.6°C | 26.3°C | 80.6°C |
| Pi Zero W | 48.0°C | 47.6°C | 30.4°C | 66.4°C |
| Pi 1A+ | 46.1°C | 48.7°C | 33.1°C | 55.1°C |
| Pi 3A+ | 50.0°C | 49.4°C | 39.2°C | 60.1°C |
| Pi Zero 2 W | 49.1°C | 49.4°C | 33.8°C | 66.1°C |
| Pi CM3+ | 49.1°C | 49.7°C | 40.8°C | 56.4°C |
| Pi 2B | 49.5°C | 50.0°C | 33.6°C | 60.5°C |
| Pi 1B | 53.8°C | 54.1°C | 37.4°C | 67.0°C |
| Pi 3B+ | 53.5°C | 54.8°C | 25.7°C | 77.4°C |
| Pi 5B | 57.1°C | 57.3°C | 34.8°C | 85.3°C |
| Pi 4B | 55.8°C | 57.5°C | 24.8°C | 95.4°C |
The most popular model is still the Pi4 (or Pi3, if you combine both types), but the Pi5 is slowly growing.
| % | Pi Revision |
|---|---|
| 48% | Pi 4B |
| 26% | Pi 3B |
| 16% | Pi 3B+ |
| 4% | Pi 5B |
Connectivity is mostly split between Ethernet and WiFi.
| % | Network Device |
|---|---|
| 58% | Ethernet |
| 42% | WiFi |
FullHD is still the most popular resolution with 4K gaining shares.
| % | Resolution |
|---|---|
| 65% | 1920x1080 |
| 15% | 3840x2160 |