Google Pixel 6a for me, just running the stock ROM/OS. I used to be into trying out custom ROMs but over the years I ended up falling in the "I don't want my phone to randomly stop working while I'm out and need to make a call" stage.

Plus, I actually enjoy quite a few features from the stock OS such as call screening (which reduces spam calls a ton), direct my call, and whichever feature is the one that provides an estimate on the wait time when calling into a toll free line. There's also "Hold for me" which I haven't tried yet but it seems like an interesting idea, but I'd only use it if there were going to be a fairly long wait.

I don't know if those features work on the custom OS options (as I don't keep up with that realm anymore), plus potential stability issues which I've always had on other devices (including previous Pixels) makes me just stick with the default.

Although, on my Pixel 3a XL since I no longer use it as my daily driver, I slapped Ubuntu Touch on it and it seems interesting, though definitely has a long way to go.