If you want an actual (non-Android) Linux phone experience, there's only one that's actually shipping:
https://pine64.com/product/pinephone-beta-edition-with-conve...
https://pine64.com/product/pinephone-beta-edition-with-conve...
If you're looking to dabble and write apps to contribute to the ecosystem, the PinePhone is arguably a steal. I grabbed one over the Librem 5 mostly due to price and availability.
And, it exists today and runs an Arch Linux derivative like the SteamDeck.
As they say in the old country, a device in the hand is worth two in the bush.