This post comes up fairly often, and I think it always narrows down to two options:

1. Yale/august locks: -More affordable, -can buy hotswappable modules for zwave, zigbee, wifi, etc but the availability seems to be hot and miss (seems like they stopped making the zigbee one last I checked, but YMMV). -Battery backup option seems cool but I’ve seen more posts about it not working that saving someone’s bacon, so I’d personally opt for the keyed version. -Some posts indicate the screens are somewhat prone to failure, but the quantity of these posts is not enough for me to write them off entirely. -integrates easily with homeassistant -has a door closed sensor for auto-relocking. Apparently it’s buggy though.

2. Schlage (specifically the encode plus, but they have a more affordable encode option) -Apple homekey integration is sleeeeek -more expensive -was almost impossible to find until a couple weeks ago -almost no reports of reliability issues, but time will tell I guess! This was the main reason I decided to spring for this lock over Yale -was supposed to get a free update to matter, but Schlage changed their minds and now said a separate model will be released with it. Supposedly due to requirements published about the standard, but I’ll cross my fingers that someone figures out how to make it work. -last I checked, no one has been able to integrate this directly into homeassistant. The best I’ve seen is someone posted a hacky solution for homeassistant to trigger an automation in HomeKit, but I think that post was lost in the Reddit blackout.

I would strongly advise against having a WiFi-connected smart lock.

I use a Schlage deadbolt. Syncs great with Google assistant with no bridge required.

I use August Smart Lock Pro integrated with Google Assistant, the integration was pretty simple but it does require you to get the Connect module to make the whole setup work.