it's not one thing but a combo
-Fast enough. iphone 14 pro max is/was fast enough
-Solid camera. I upgraded 14->16 pro max specifically for the camera
-all-day battery. iphone 14-16 also have this handled.
-integrations. and this is the iPhone trap for me, airdrop, imessage, facetime. I know there are alternatives but nothing has worked quite like facetime for us and I live-or-die on imessage. These are mostly seamless and simple.
-USB-C, so iphone 14 had to go...
-wireless charging
-durability
No bloat, no extra bundled junk. This mostly eliminates samsung for me. Also had so so so many issues with samsung phones and basically all samsung products. I have had samsung zoom envy, but I think non-zoom the iphones take much nicer photos.
I don't need a lot of customization, I need functionality. A phone that takes great pictures that works right out of my pocket no fuss. easy share images/videos directly via airdrop (quicks share is clunky in comparison, and convert a phone call to a facetime live so 'grandma' can take the call.
I'm interested in something like a One+13 which checks all the boxes except for the software bits for me.
One of the things that irritates me most about the smartphone ecosystem is that basically all android vendors (or maybe it's google's fault) are chasing features to beat iPhone but missing the base requirements that most iPhone people want. Yeah, top-tier androids have great cameras, often huge batteries, but converting a call to video is wildly less effective than facetime, google messages on web is a functional but 'afterthought' imessage replacement, and quick share isn't nearly a clean as airdrop.
I really like the One+13 for instance, checks a LOT of the boxes for me. A new Pixel might as well. But I really need the software bits to line up.
And to be clear, I'm on iPhone for features, not fandom. I like my 16 Pro Max less than I liked me 14 Pro Max, and the 'AI' bits seem to get more in the way and feel more like bloatware so iPhone has lost some of it's luster for me.