Specifically in my case Pi 3B vs ZeroW, but ideally more generally:
What are the differences between the two from a boot perspective (other than are obvious from the differing hardware)?
The reason for asking: I have been playing with Plymouth to change the boot visuals, and on a 3B I have no problem displaying a splash screen with minimal other info. Indeed a clean Raspbian desktop install does this.
But if I transfer the uSD card to the Zero it refuses to do this, always displaying the three-dot splash.
As this is the same on a clean Raspbian install, I assume there's an underlying reason for it?
If so, then I'd like to better understand why and any other subtle differences that aren't as obvious as "it doesn't have an Ethernet port", which is pretty much all I got from Googling.