[abraxas]

Looks like Pixel 9a is supported by LieneageOS. No phone jack but otherwise a very competent modern device.

Instead of trying to shop locally from such a small pool of devices I'd advise the OP to pick a protective case and a screen protector since they seem to hang on to their devices for a long time. A device like the Pixel 9a or the upcoming 10a with their oversized battery for the specs is likely to deliver many years of service before degrading to the point of being unusable.

[microflash]

I’d recommend Pixel but they have terrible battery life and they heat up pretty easily. On the other hand, they have support for Graphene OS, long software support and very nice cameras. Samsung and Xiaomi are absolutely worst choices when it comes to software; they are filled to brim with bloatware and worse, blatant spyware. The only way to use them is to immediately install a clean alternative OS, such as LineageOS.

[abraxas]

I have had no issues with any of my Pixel phones overheating and I've had many. Maybe you have an issue with a specific app that misbehaved in the background?

I don't think there is any inherent flaw in the design of the pixels that causes them to overheat or drain battery. And the OP is likely to replace the Android OS with Lineage anyway.