BYU 2020 opponents ranked
21 (loss) - CCU
37 - UCF
41 - Boise
59 - San Diego St
84 - Houston
92 - Troy
99 - UTSA
112 - Texas St
114 - Western Kentucky
116 - Louisiana Tech
117 - Navy
162 - North Alabama

So that's one good team (0-25), 3 okay teams (26-60), 3 weak teams (61-100), 4 very bad teams (101-150), and 1 truly abysmal team (151+)

Utah's opponents were
6 (loss) - Oregon
15 (loss) - Texas
17 - Washington
26 (loss) - USC
37 - Arizona St
41 - Cal
46 - Washington St
57 - Oregon St
61 - UCLA
63 - Colorado
67 - BYU
83 - Arizona
124 - Northern Illinois
192 - Idaho St

So let's start pulling similarities out to reduce it to a smaller comparison

Utah lost to #26 USC 30-23, BYU lost to #21 CCU 22-17. Pretty close, but slight edge to BYU.

Utah beat the #37 team Az St 21-3, BYU beat the #37 UCF 49-23. Probably about equivalent, maybe slight edge to BYU?

Utah beat the #41 team Cal 35-0, BYU beat #41 Boise 51-17. Probably about equivalent, slight edge to Utah?

Utah beat #57 Oregon St 52-7, BYU beat #59 SDSU 28-14. Edge to Utah

Utah beat #83 Arizona 35-7, BYU beat #84 Houston 43-26. Slight edge to Utah

Utah beat #124 Northern Illinois 35-17, BYU beat #117 Navy 55-3. Edge to BYU

Utah beat #192 Idaho St 31-0, BYU beat #162 North Alabama 66-14. These games are both meaningless so no edge to anybody.

So the resume from those 7 games is about equivalent.

Stripping those out leaves Utah with the following
#6 (loss)
#15 (loss)
#17 (win)
#46 (win)
#61 (win)
#63 (win)
#67 (win)

And BYU with
#92 (win)
#99 (win)
#112 (win)
#114 (win)
#116 (win)

It's pretty clear that BYU's schedule in 2020 was easier. That's not anything to be ashamed of, there were unprecedented circumstances, but we should at least be willing to admit that the schedule was very weak.