It took me a bit of time to put some scripts to do consistent testing, but now I have initial results.
Only local destination tested yet, but I plan to test with WebDav against box.com and also with Google Drive.
Depending on the results, I may test with Backblaze B2 as well.
I used mostly defaults for both products, enabled encryption and VSS.
One customization was to enable 4 upload threads for duplicacy - it supports multi-threaded upload and it would be very disadvantageous to restrict it.
I put data into Google Spreadsheet here: