Not many great options remain. DivestOS would've been your answer a few years ago. But that project's been shuttered for over a year. If it's still new enough to still receive OEM security updates, probably stock OS.
LineageOS is the only alternative ROM I'd ever consider even mentioning, as there are certain EOL devices that may be abandoned by the OEM but continue to be maintained through Lineage. But that's admittedly harm reduction to yield a worse end product than the cheapest android you can buy at Walmart