The CoL is lower in America. It might be comparable if you try to buy a house in Manhattan or the bay area, but the suburbs are good options and the commutes are no worse than GTA to Downtown or GVA to Downtown Van. There is a 46% premium on housing between Canada and the USA, adjusted for exchange. Also every day life can be generally cheaper (groceries, gas which is about half the cost, cell phone and internet service etc.).
The big differentiator between Canada and the US is social. Our socialized healthcare is subpar to the type of healthcare you get through the private plans you'll get working at big tech companies. Wait time are long, and governments don't pay for the most up to date procedures. I'm speaking first hand. Schools are the other big thing. Where you live in the US really determines the quality of education your kids receive, but if you're getting paid FAANG salaries you're fine.
Anyway, again, as my note mentioned, I'm not here to discuss the merits of the Canadian tech market. I only posted this to dispel the notion that the US is worse. It's not, and the supposed benefits in Canada objectively are not there. Subjectively they might be. Everyone is welcome to their opinion.