What is the best SBC model for custom libre-linux build?

[Mwo87]

I am considering buying a few Pine64 SBC's, but I need to know how amenable the various models are to building a fully libre custom linux. Specifically, building my own ATF, mainline U-Boot, mainline de-blobbed kernel, etc.

I own some Libre Computer Tritium boards and have successfully done this with them, but I've found the hardware somewhat unreliable, e.g ethernet ports going bad, etc. so I am looking for an alternative.

Would RockPro64 or H64 be a good fit for what I am doing? Also, are the Wifi/BT modules usable with open firmware?

Thanks