As a rule of thumb, schools discourage students from taking an exchange if they need to find a job. That's one reason why the exchange generally happens after the summer internship: students with offers can take the exchange, leaving the careers team to focus on fewer people. Very few schools (Chicago, Insead, Harvard etc) have careers staff focussed on supporting job hunts in other countries. On my exchange, I found the careers team were polite but always put their own students first. I got a great review of my resume. I was able to access the alumni database while a student. I could attend most, but not all, events organized by the careers team (often only when not enough of the home-school students wanted to attend). 
You also have to consider the visa situation and the domestic market. Canada loves foreign talent because it can be paid a discount. The USA doesn't. UK recruiters know what an MBA is; many French ones don't. 

Unlike the US, Canada is open to turning talented foreigners into permanent residents. There is a high supply of such talent in Canadian business schools, so they clear off the market at a low market price. In the US, there is a low demand for such talent and regulatory burdens. There is, in effect, no US market for turning talented foreigners into permanent residents other than the black market for marriages of convenience. 

So, I think the factors to weigh up are:
1- How high are regulatory barriers (Low in Canada, medium in the Uk and France, high in the USA)
2 - How high are the cultural and linguistic barriers (You could use the International Mobility score of the FT to calculate national averages)
3 - How understood is the MBA (High in English-speaking countries, low outside)
4 - How good are the schools perceived to be (You could use the Recommends score of the FT to calculate national averages)

[Edited by StuartHE on May 14, 2020]

IESE, HEC and Esade are substantially better for international mobility, and for employment, than IE. IESE is worth the wait, but go to Esade is they don't admit you. Or take a semester full-time to perfect your French before starting at HEC.

Sorry, but there's no simple answer to all these questions. Of course rankings have to make schools commensurable, but in reality the same schools are differently valuable to individual students. Schools improve themselves in different ways, including performance that is exclusively focussed on gaming the rankings. Obviously, for most people wanting to work in France HEC is a better choice than IESE or IMD but for others those schools might have educational advantages. HEC is a bit like Stanford: hard to get in but easy to graduate from. IESE and IMD are unavoidably hard work after you arrive. Any grande Ecole is great for the socialisation of engineers into political hierachies; IESE and IMD is better for autonomous leaders.