Of course that would depend on the price differences in the used market.
Not sure where you are located, but typically in the U.S., 16" 2019 Pro's sell for around the same price as an M1 MacBook Air or higher-specced M1 Mac mini.
Unless you need Windows, then any M1 machine is a way better buy. Support for Intel Macs will be gone in 2-3 years most likely, and if the PPC to Intel transition is anything to go by, then mainstream app support (eg: browsers) will be gone around a year after that.
On the other hand, all M1 machines will be getting major OS updates for at least 4 years, and browser support will continue for much longer.
Also, Intel Macs (especially the last ones, such as the 16" 2019 MBP) are extremely notorious for getting extremely hot, thermal throttling (CPU gets so hot that it has to downclock) and having bad battery life compared to ASi Macs.