US stock exchanges or Canadian ones?

Hello, I have a pretty basic question. We live in Canada and years ago, we joined the Motley Fool (before TMF Canada existed.) We were always told that it was more profitable to invest in US markets long term as the US economy is bigger. So we did, and have always made all our investments in USD.
A Canadian friend who is new to investing has asked us to help her start a portfolio. We are planning to recommend some of the basic foundational stocks such as Apple, Alphabet, Meta, etc.
My question is, if these stocks are traded on Canadian stock exchanges with a Canadian price, is there any advantage to buying them on US stock exchanges and paying in USD?

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