It would help if you disclosed your budget and the name of your preferred wireless carrier.
A used Google Pixel XL in good condition is currently priced around $100-$130 on eBay, and supports all U.S. carriers. This model is on LineageOS 15.1, but should be upgraded to 16.0 once a technical issue is resolved. The Google Pixel XL's PassMark rating is just over 40% higher than that of the Samsung Galaxy S6, and it packs a good camera and an above-average 3,450 mAh battery.
https://www.gsmarena.com/google_pixel_xl-8345.php
https://www.reddit.com/r/LineageOS/comments/at3bf5/_/egzcoxb...
https://www.androidbenchmark.net/device_list.php
https://www.dxomark.com/google-pixel-camera-review-retested-...
If you're looking for something more recent, a used Moto Z2 Force is in the $100-$150 price range, but comes with compromises. Its PassMark score is about twice that of the Galaxy S6, but its camera is weaker than the Pixel XL's and it only has a 2,730 mAh battery. On the other hand, the Moto Z2 is a modular phone and is compatible with a range of Moto Mod accessories, including extended batteries. The Z2 Force already supports LineageOS 16, and the unlocked version works on all U.S. carriers. Its screen is shatterproof, but susceptible to scratches, so a screen protector is highly recommended.
https://www.gsmarena.com/motorola_moto_z2_force-8693.php
https://www.dxomark.com/motorola-moto-z2-force-review-motoro...
https://www.motorola.com/us/moto-mods
OnePlus phones are also good options, but they're mostly limited to GSM carriers. If you're in India, South Korea, or another country with compatible cellular bands, the Xiaomi Pocophone F1 offers excellent value with a fast processor, a good camera, and a large battery.