OC region is more favorite in comparison to region EU ???
We have some numbers for FY 2015.
OC region:
Max CN 2306
Number of entrants 24,110
Chance of selection ≈ 9.5%
For a couple (two entries) the chance increased to
a decent 18.2%.
I don't know if "bad entries" were eliminated from the 24,110 number before (not during) the draw. So the true chances could have been slightly higher, due to reduced competition.
The region was completely overselected. The chances to get a case number that made the cut, were 6.2% and 12%, respectively.
EU region (w/o U2):
Stripping Ukraine and Uzbekistan from the data one has
Max CN 17,675 (estimated)
Number of entrants 1,113,429
Chance of selection ≈ 1.6%
For a couple (two entries) 3.1%.
The region was almost current.