For me it's the added security features: per-app network permissions, scoped storage/contacts permissions, and a bunch of system hardening measures.
replyThe ability to sandbox Google Play Services (if you need it, but realistically, you probably do) and to simply not assign it more permissions than it absolutely needs is awesome. I run it with very restricted permissions, where it by default requests every single permission it can. In stock Android, it has all those, and you can't limit it. Just that is worth it for me.
replyIf you actually degoogle, supposedly battery life is better but if you start adding back in sandboxed play services, you lose some of the gains.
replyGreatly improved privacy and security and end-user control of your phone and its data. In those areas, possibly the best option, though iPhones might be better in security (not necessarily the other two areas) - Apple has a slightly bigger budget and a few more engineers, and directly controls the hardware.
replyGrapheneOS exists to greatly improve the privacy and security of an existing open source OS project. Android Open Source Project has good privacy and security as a starting point.
replyPixels provide strong hardware and firmware security. Pixels have made multiple significant hardware and firmware level improvements based on recommendations by GrapheneOS. GrapheneOS now has a hardware partnership with Motorola Mobility which includes working with Qualcomm. It isn't only a software project.
Regularly leaked data on the capabilities of Cellebrite show they have the least success with GrapheneOS by far despite specifically hiring for it based on their job postings.
It will depend on your banks/services. If those apps strictly implement Play Integrity API, you won't be able to use them on Graphene OS
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