Bolingbrook is no longer in the SWS and it makes a big difference in the calculations you presented.
recalcuting the average MaxPreps ratings:

SWS = 17.93 with 15.09 avg schedule strength
DuKane = 15.69 with 12.64 avg schedule strenth

Removing the SWS best team, L-W Central, the SWS average rating is still better at 16.09 vs 15.69. Even when comparing top to bottom, SWS scores higher than DuKane.

Top 3rd: 27.46 vs 23.10 and sched strength 16.75 vs 14.28
Middle 3rd: 20.46 vs 17.86 and sched strength 15.11 vs 12.57
Bottom: 5.88 vs 1.33 and sched strength 13.41 vs 10.29

Lastly, head to head SWS is 4-0 against the DuKane this season.
LWE over STCN 5-1
LWC over STCN 4-0
Lockport over STCE 7-1
LWE over STCE 12-0

On paper, I’ll take SWS, but it all depends on how they all do in the postseason and we’ll all see soon enough.