OnePlus seems to be a favored line for Lineage. You'll notice that the One, a 5(!) year old phone, is still on the initial-adopters list for 16.0. The 3T, two years old, has 6GB ram and still stands with the latest flagships in terms of raw power. The whole line is known for being really easy to put ROMs onto and being a great bang for your buck, and in theory any concerns about Chinese software would go away given that you're putting a new OS on there.