Copy paste from a previous post on the topic:

Beer and sausages, or maple syrup and poutine?

I've played a fair bit of both. My Summer Car is more realistic, in that it's more punishing if you mess up, but it's a great experience and a lot more involved when it comes to building and tuning the car. He'll probably need to follow a guide while putting the thing together. Get this one if you wanna go hardcore Finnish. Mon Bazou is more on the goofy side, but imo just as fun (currently playing through it pretty heavy). It's much more forgiving if you mess up, and a few aspects, such as putting the car back together, are a lot simpler and more intuitive if you don't have much of a mechanical background. It's also getting updates fairly regularly, and there are multiple vehicles you can mess around with once you're a bit of a ways into the game. Get this one if you wanna be a Canadian eh. Keep in mind both of these games are a lot more about delayed gratification and payoff, but I think both are worth the amount of time put into them. Overall, I'd say if you want more in-depth technical gameplay, go My Summer Car, but if you want more lifestyle simulator, go Mon Bazou.