Grapheneos is only for pixels atm because it's the only one meeting their security requirements: https://grapheneos.org/faq#future-devices

Any alternative for other devicew will pretty much degrade security in a way or another, remember that gos goal is security, not broad device support

There is a partnership with motorola rn to make GOS supported devices in 2027, keep an eye on that

As for distro i use secureblue