Canadian IB or American IB and exit opps

I have 2 questions about how Investment Banking works in Canada vs the States.

What I've been reading on many posts is that in Canada, the general route is career banking while in the States it's IB to PE/HF. I'm a Canadian citizen at one of the best Canadian schools for IB which sends people to NYC, LA and Toronto.

I have two options for a career in finance:

The first option is to work at a Canadian Big 5 in Toronto. Promotions are common, job security is higher than NYC/LA and most people here at career bankers. The tradeoff is that comp is 20-30% lower (I think? Correct me if I'm wrong).

My second option is working at a BB in the States and leaving to PE/HF as career banking isn't seen the same way as it is in Canada. In PE you get less security and chance of moving up though you get much better comp.

I'm torn between the two because Canada seems safer but the State has more opportunities and jobs in general. Is the safer job worth the smaller comp?

My second question is what people go into after both of these paths.

Once you get to VP/D/MD in Canada, do you stay until you choose to leave or are you sort of pushed out after a few years? Where do the people who get pushed out of Canadian IB go when you're an analyst or when you're an MD?

And my question is the same for the States. Once you exit to PE, do you stay until you choose to leave or is there a "life expectancy"? Do most people head to Principal/MD when in PE? What about people who get laid-off in PE/HF where do they usually go?

An answer to any of these questions would be greatly appreciated.

(Also yes, I know this is thinking really far in the future and yes I know these questions probably seem stupid to many people here)