I also use both.
Started with a used Homey back in 2020, it seemed the best fitting device to me.
After reading lots of these replies to issues: “yeah, but this and that just works @ HA”, I started with running a VirtualBox HA VM image on my linux laptop.
But the great dashboard possibilities made me curious as well.
Later on I migrated it (I just had to copy the VM) to an old NUC running Debian with VB.
At some point I “migrated” (= starting from 0) all zigbee devices to zigbee2mqtt. Z2M is such a joy.
Both HA and Homey are integrated, I wrote a tutorial for it.
For some (exotic/impopular) stuff you need to copy/paste some yaml code, but not in general.
The user friendliness of the automations part has been improved a lot this year, I have around 40 of them now;
And the new dashboard layout (& functionality!) named “Sections” is just awesome.
With every request I read @ Homey dashboard topic, I think, hmm, but that’s possible already with HA dashboards?
Ánd it’s web based, I really don’t get the idea why Homey dash is app based.
And, as a stubborn Pro19 user, I also have Matter (+ Tread), Energy Dash, and whatnot with HA integrated.
I bought Advanced Flow as add-on, and it’s really a joy to program my home with.
Advanced flow is based on Node Red, or, is probably used as inspiration if you will, but it’s quite easy to use, compared to Node Red.
I still like to manage it, but I can’t find a clear tutorial. It’s just not encouraging when nothing you do seems to work.
My 2 cents 
