Not sure they are really comparable. One is a largely tech free ride and a long one at that, the other is very high on tech an made up of shortish loops.
So Stainburn if you like testing your skillz, Dalby if you want to put some miles in.
This. If you go to Stainburn you can always drop down to Swinsty Res and do the loop round there.
There’s some great natural riding from Summerbridge, near Stainburn or all round Dalby heading from Pickering to Whitby and everywhere inbetween.
Also as above, I prefer Gisburn to both Dalby and Stainburn and it’s only another 40 to 50 mins from Stainburn.