Saturday 8pm Showdown BBC2 v Channel 4

What if you could only watch one? No DVR, recording or iplayer or 4OD. Which would you choose
8pm on BBC 2 Domesday. Baxter's explores a unique theory on the Domesday book.
8pm on C4 - The Untold Battle of Britain. Docu-drama highlights the bravery of Polish pilots in WW2.
The edge goes to C4.