So let me make your claim perfectly clear: You believe if you hit a tree in a honda Civic, you'll be less likely to be hurt than if you hit that same tree at the same speed in a BMW 5-Series?
i dont wanna make that claim because BMW is a luxury brand that probably has way better safety features. But if you replace BMW 5-Series with Toyota Camry then I'll say yea. It's important for the two cars being compared to have similar safety features, just different weights