Which smart home system is suitable for our new building?

We had to do without wired systems for cost and feasibility reasons, and now I do everything wireless myself. Choose a manufacturer-independent central unit (ioBroker, openHAB, HomeAssistant...), then it doesn't matter if you wait for Matter and which systems you use. For example, I combine Alexa, eufy, Shelly, HomematicIP, Unifi, Aqara together and am completely flexible when it comes to gimmicks.

Doorbird seems Apple-like to me: Looks good and works, but in the end you pay for the design. So far I couldn't find a "better" feature set. I initially wanted to work with the new Unifi Doorbell, but it has been out of stock forever. I just got the new eufy Doorbell and I like it. A reaction time of 5 seconds seems acceptable to me for a video doorbell.. In any case, not a Ring, which only costs additional monthly fees, as already mentioned.

or other surface-mounted doorbell (doesn't look so good visually)

Deep flush-mounted boxes (63mm) are standard for us

The Doorbird is quite interesting for us because the cloud is free and the Doorbird can be combined with the new ekey Fingerprint sLine flush-mounted with the doorbell (of course, it looks very high-quality)

The new ekey Fingerprint xLine, on the other hand, is mounted individually on the facade and above it, the Ring or Eufy or another surface-mounted doorbell is mounted individually (doesn't look as good visually)

Does anyone have experience with the Doorbird?