As compared to Alexa? I bought their preview hardware (and had a home-rolled ESP32 version before that even) and things are getting closer, I can see the future where this works but we aren't there today IMHO. HA Voice (the current hardware) does not do well enough in the mic or speaker [0] department when compared to the Echos. My Echo can hear me over just about anything and I can hear it back, the HA Voice hardware is too quiet and the mic does not pick my up from the same distances or noise pollution levels as the Echo.
I _love_ my HA setup and run everything through it. I'd like nothing more than to trash all my Echos, I cam close to ordering multiple of the preview devices but convinced myself to get just 1 to test (glad I did).
Bottom line: I think HA Voice is the future (for me) but it's not ready yet, it doesn't compare to the Echos. I wish so much that my Sonos speakers could integrate with HA Voice since I already have those everywhere and I know they sound good.
[0] I use Sonos for all my music/audio listening in my house so I only care about the speaker for hearing it talk back to me, I don't need high-end audiophile speakers.