I am successfully using DevonThink on my Mac and iPhone, and syncing via WiFi (bonjour).
I’d like to also sync my databases to an iPad. I don’t recall whether that was allowed or advisable. I assume the sync would be Mac <–> iPhone and Mac <–> iPad, never iPhone <–> iPad.
Is syncing between Mac and two separate iOS devices supported?
Yes, only one device should be the Bonjour server, so given your situation the above is correct. You can add multiple devices to sync via Bonjour. I have an iPad as the Bonjour server, and I sync a Mac, an iPhone, and another iPad to that.
I’m curious about syncing via Bonjour vs iCloud
Bonjour locks me into my home network and the Mac has to be active
ICloud locks me into the internet, but it’s mobile
With mobile devices, I want my syncing also to be mobile