Hi again! I've just spent 2 weeks with an S23, the third time I have done this (I returned the previous 2 phones because of the camera's banana blur problem, and will retire this one as well).
The S23 is objectively the better phone (vs. Z9 or Z10), primarily due to the display's max. brightness, the cameras' flexibility (not a fan of the colors, though), and the length of guaranteed updates. If this matters to you, thickness too - the S23 is clearly slimmer. It may also matter than there is a much broader variety of high-quality accessories for it.
That said, the Zenfone has quite a few advantages: width (the 3mm are very, very tangible for those who prefer smaller phones); headphone jack, if it matters to you (esp. since the S23 lacks a DAC for the USB-C audio out and finding good adapters can be either a hassle or expensive); faster and more reliable fp reader (and not a bother with glass screen protectors); a much cleaner yet very customizable Android; and battery, which is tangibly better.
In terms of bugs, both have their share of minor issues, in my experience. The only one which annoys me is that the S23, while good/fast at updating brightness to brightER light conditions, constantly seems to forget my settings for darkER circumstances. The screen is always too bright in dark areas and somehow neither resetting, nor other fiddling seems to ever help. Eh...
I have to say that, disappointingly, Samsung has also been a bit unreliable with the latest rounds of updates (much like Asus). Europeans (minus the UK) missed one update (jumped from 05/23 to 07/23), and the latest one (08/23) was released in Asia and the US two weeks ago but not in our neck of the woods.
