honestly, I can't tell you which one is better.
I'd suggest you look at the employment reports.
at the same time, you should take into consideration rankings, scholarships and tuition costs
IESE is ranked a lot higher (11 vs 86)
Scholarships I can't talk about, as I don't know if you have received any
tuition costs Rotman is slightly (about 13000 eur) cheaper than Rotman
take those into account while looking at employment reports. Also look at which consulting companies recruit at said schools, as just "consulting" is very general and every business school can get you into consulting (you can even do so without a business school)