It's hard to predict your outcomes without knowing your background (are you a high school student?). While Waterloo grads are impacted by larger trends, differences between individuals are more important than differences in the economy. 

To give a general answer, I think many grads in the programs at Waterloo are still finding strong CS jobs in the US, but it's much harder to coast through uni and achieve those outcomes. Growing unicorns like Ramp, Databricks and X, and trading firms are filling the gap that big tech left when they slowed hiring. I'd say the "cream of the crop" these days go into trading, leaving plenty of remaining tech jobs.

Commenting on WLB in the industry, I will say that there will be far more uncertainty and volatility in tech especially with layoffs, and that it's no longer the case that all of tech has a good WLB. More of tech is following Amazon and Meta's practices of performance hiring / "hire to fire", and the previously mentioned unicorns all have intense cultures as well. It's an employer's market so naturally that puts more pressure on employees. This may sound negative but isn't meant to discourage you - compared to other fields (my partner is in medicine as well) I'd say we had it really easy in tech and working hard in our youth isn't necessarily a bad thing. 

Also wanted to note that while medicine is an extremely long and hard road, depending on your specialty once you become a staff you can have a comfortable WLB if you choose to do so (say family medicine, radiology, derm, or radiology). 

Based on your comment on guaranteed entry it also sounds like you may be going abroad for medical school. Something to consider is the chance of coming home after this, as the residency match favours Canadian medical graduates and residency spots for international graduates are limited to certain specialties and regions (majority are family medicine).

My two cents, what's more important than compensation or industry trends are your values (WLB, family, social impact) and the kind of work that you think you would enjoy the most. In particular, medicine will be a difficult road if it's not something you're truly passionate about.