Which county will be More D?

[lfromnj]

Results for IN
+20.4 Clinton, 37.3 Trump,67.7 Clinton
+30.9 Obama 2012, 33.9 Romney 64.8 Obama
Results for IL
+20.2 Clinton,36.2 Trump,56.4 Clinton
+8.4 Obama 2012, 45.1 Romney,53.5 Obama

Two counties within the same metro and only a few dozen miles apart but with completely different political histories
Although pre 1932 both were Solid GOP after the Depression started the Illinois county was Solid D besides 1956 and 1972.  It still gave Clinton a comfortable +20 majority but it is the worst for a Democrat here since Micheal Dukkakis.
On the other hand Lake county IL used to be solid GOP since the civil war, only barely voting for IL only to return back to Solid GOP with candidates like Reagan almost hitting 70%. However in 1996 Clinton won it by a few hundred votes, but it voted for Bush twice,and Obama managed to win it by a landslide 19% in his 2008 Landslide home state win. It returned partially back to form with only being +8 obama in 2012 but Clinton outperformed Obama's 2008 victory with a greater than 20% win due to repulsion for Trump.


So which county will be more D in 2020?
I would like to mention Lake County IN has gary and east chicago, although the shrinking of these cities have largely abated there is still enough shrinking just the 2016 to 2020 shrinkage would be enough to make Lake county IN less D than IL.