Is there even an option in the Android space that isn't entirely filled with Bloatware? I've always hated the Samsung Android skin so I've mostly written off the rest of the market
If you are considering Nothing, you might as well go for Samsung and uninstall all the bloat from the user profile with adb/UAD. It will at least have a separate secure processor (Knox Vault, IIRC even recent mid-range A5x) and not a TEE that runs on the main CPU and is vulnerable to side-channel attacks. And the SoC (at least if Exynos and I believe the latest Snapdragon 8 Elite) supports MTE, which Samsung is rolling out support for in OneUI 9, etc.
Going from a Pixel to a Nothing Phone is like going from a modern iPhone to an iPhone before the 5s in many ways security-wise (the first iPhone with a secure enclave).
But yeah, despite the hardware issues, Pixel with GrapheneOS is still your best bet for a vanilla, secure Android.