I’ll take the big performance jump with a comparable fan noise to the 2015 15” any day. I used to play Cities Skylines and similar games on that 15” and I don’t think the 16” is noticeably or indeed any louder. It’s also possible to minimise (or even eliminate) fan noise for non-demanding games on the 16” using some of the tweaks mentioned.
Turbo Boost Switcher works well when playing games in macOS. It sets the CPU to a constant and stable base frequency, which is better suited to gaming than the schizophrenic behaviour these chips normally exhibit by design; drawing large power spikes to reach their boost clocks and considerably more on average, with associated heating up to 99 degrees.
With Turbo Boost disabled, I find the CPU uses no more than 10-12 W and remains cool at around 66 degrees, even during gaming. This leaves more power available to the rest of the system and GPU.
Granted I haven’t played any demanding 3D games yet; and I expect fan noise when I want the most power; but for non-demanding games I’ve been able to play completely silently even at the native resolution, and that’s without tweaking fan profiles. In general there are even more options in Windows, which I’ve yet to explore.