So I went and did some analysis for that with some caveats, cause I don't have all the time in the world.
I tallied up the wins and losses against ERA of the opposing starter (didn't account for the starter doing well but the bullpen blowing it) as well as team OPS for the game (again could be against bullpen and not starter) for both the Jays and Yankees (cause I had a sneaky suspicion that Yankees not only faced 'weaker teams' but also weaker starting pitching overall).
If it was a bullpen game or starter got knocked out in the 1st inning, I chose to use the ERA of the bullpen arm that went 3+ innings or simply stated bullpen game and took the collective AVG ERA if all arms pitched <= 2 innings.
ERA picked is current rather than at the time to account for normalization rather than one bad start/one good start.
Some pitchers who are in the 3.00-4.00 ERA group are trending towards < 3.00 ERA group (Pivetta, for example).
Obviously ERA is not an end-all/be-all of pitcher excellence, but it was the easiest to fiddle with.
---
Jays
The Average ERA of all starting pitchers against whom we've won: 4.35
The Team OPS during these wins: 0.836
The Average ERA of all starting pitchers against whom we've lost: 3.94
The Team OPS during these losses: 0.612
Win% against pitchers <= 3.00 ERA: 0.5 | 16 games played, Team OPS of 0.637
Win% against pitchers (3.00 - 4.00 ERA]: 0.46 | 26 games played, Team OPS of 0.673
Win% against pitchers > 4.00 ERA: 0.7 | 28 games played, Team OPS of 0.863
Average ERA of all starting pitching faced: 4.17 +/- 1.924
---
Yankees
The Average ERA of all starting pitchers against whom they've won: 4.54
Their Team OPS during these wins: 0.787
The Average ERA of all starting pitchers against whom they've lost: 4.11
Their Team OPS during these losses: 0.599
Win% against pitchers <= 3.00 ERA: 0.75 | 16 games played, Team OPS of 0.656
Win% against pitchers (3.00 - 4.00 ERA]: 0.73 | 15 games played, Team OPS of 0.653
Win% against pitchers > 4.00 ERA: 0.7 | 38 games played, Team OPS of 0.810
Average ERA of all pitching faced: 4.43 +/- 1.982
---
TL;DR
There's some inkling that Jays are slightly better against elite pitching than average-above average pitching but not much of a difference.
Yankees have definitely faced worse starting pitching than the Jays; even when facing good teams, they lucked out quite a bit to get their 4th or 5th starter.
Our Team OPS is higher in every setting except when facing elite pitching - this can be attributed to age/experience, coaching diff, or the fact that Yankees faced 10 different elite pitchers (3 against Manoah, 3 against McClanahan, and 2 Rays' Bullpen sessions) while Jays faced 14 different elite pitchers across the spectrum (only double-ups were Montgomery and Cortes)
Another thing to note (and would be evident if I changed the parameters a bit) is Yankees only had 6 games with SP's ERA under 3.3 (but above 3).
Jays on the other hand 14 games with SP's ERA under 3.3 (but above 3).
Actually ridiculous how strong of a pitching we had to go up against.
Fun stuff.
