Um, no. Even though SV is a high-cost location in a (relative to the U.S.) high-tax state, personal income taxes are still substantially higher in Canada. Housing might be somewhat more in Waterloo than in SV, but the net take home at the end of the year would still be higher.
Assuming you're married and can file a joint tax return w/ your spouse, the U.S. tax advantage goes up even more.
There is no question that if you want to make a lot of money in tech, the U.S. is still the place to be. I say this as someone who has lived and worked in Canada, Southern Californian and now Australia.