As a stock experience, the google pixel phones are unbeatable, pretty much the "reference" edition of android phones. The nothing phone, made by one of 1+'s co-founders, is also fairly clean and has a different set of features.

If you're willing to get your hands dirty, then you can install https://lineageos.org on several brands of phones (https://wiki.lineageos.org/devices/), and if you're willing to ditch android altogether then the grapheneOS project is worth looking into.

The Pixel line of phones supports both lineageOS, grapheneOS, and comes fairly nice stock so I'd wholeheartedly recommend it