The headphone out of my z8 can drive a full size Denon d5000 headphone well. Better than my old phone. It has decent output up until 150 Ohm, I tried.
The others I won't comment as it depends on your previous experience in my opinion. I myself had a IPS panel phone before, and surprised how small the viewing angle on this OLED.
You move a bit and white appears slightly more yellow or pink. It turns out it is common, but for me it was strange first.
ma.van.drunenWould be honest.Zenfone series have never disappointed me.
I guess the Zenfone 8 ticks your boxes, depending on how intensively use your phone. Battery life is not super yet (I am a fairly light user and can squeeze out about 6 hours of SOT), but I expect it may improve after a few updates. I think it is the best 'small' phone currently on sale, but if you are also in for larger phones there is more competition.