I'm upgrading because my phone is losing (lost?) support. I use a OnePlus 7 Pro and love it and wouldn't bother upgrading otherwise. I'd appreciate some recommendations of android phones you like, please.
I also love my Oneplus 7 Pro, currently running crDroid (on Android 13, based on Lineage). It is updated semi-weekly and maintained by one person. It gets the latest security updates, but I am unable to relock the bootloader, if that is relevant to your threat model.
I'm probably going to do a battery swap soon and really want to use this phone until it breaks!
After four years there are no more security updates coming from OnePlus, unless someone started doing the work themselves. This is the only reason I updated my last phone.