Sony DPT-RP1 (Android) or Onyx Max 2 ?

Sony
Pros
Lighter more compact
Made by Sony
Case cover available

Cons
Android isn’t from the factory

Onyx
Pros
Original stable android
Good native PDF reader app
Cons
Too balky
No case cover

Mainly needed for two/three columns academic PDF reading

Please add your opinion on the topic.
Thanks.