Well, I was describing Yonge & Eg and the area within walking distance, if we're talking about the whole street there's much more variability.
As to why Bloor will have higher ridership, this is pure speculation on my part, but I'll take a stab at it:
Bloor is 6km longer.
Anyone going downtown from the east or west (Scar or Etobi) will use Bloor.
Bloor is connected to streetcars & buses which go downtown
Bloor has major institutions like U of T, to state the obvious a huge school.
Downtown in general has more offices & destinations, financial district, universities, hospitals, and Bloor is much closer.
There are way more jobs along & near Bloor than Eglinton.
Look a the difference between Yonge-Eg and Yonge-Bloor. I love Yonge-Eg but Yonge-Bloor is clearly a way bigger & more important intersection.