While Home Assistant is indeed "involved", it's not actually that hard once you are used to it. However, I rely on Hubitat for my automations, as it is far easier to create complex automations with Hubitat than with Home Assistant.
For integrating HomeKit only devices, I would lean towards HA, but for bringing non-HomeKit devices into HomeKit, I prefer Hubitat with Homebridge since its device support is very broad and not limited to only the devices and features Apple allows.
Last time I looked at using Homebridge with HA, I couldn't find an integration. I'm sure this is because HA has a built-in HomeKit integration, as well as a HomeKit Controller integration (turns HA into a sudo HomeKit hub, but without the secure remote HomeKit control that an offical Apple HomeKit hub offers). However, there's a catch for Home Assistant's HomeKit integration that I really dislike. Unlike Homebridge, you cannot choose which devices on HA you want to expose to HomeKit. It's all or nothing. So if you use the HA HomeKit integration, your HomeKit Home app becomes a mess of devices you might not nessecarily want exposed to HomeKit.
But there's a place for both of these hubs. I use the HomeKit Controller on Home Assistant to bring my Aqara FP2 into Hubitat by way of the Home Assistant Device Bridge integration, and I also bring in Aqara, Mijia and IKEA Zigbee devices into Hubitat via HADB since they're extrememly stable on HA. With the exception of a few other cloud integraitons, everything else I own is joined directly to Hubitat, or connected via some other bridge integrated into Hubitat. I've got better things to do with my spare time, and I don't like having to struggle to integrate anything. Having both Hubitat and Home Assistant affords me the ease of integrating just about anything I want, with very little effort.
