Office 365 is literally double the price of Gmail, and full-blown Exchange is even more expensive. I wouldn't call double the price "roughly the same".
It’s literally not double the price. Office 365 is $5-15 depending on edition (Business Essentials, Business, and Business Premier) and if you do an annual commitment. That’s the same price range as GSuite which is $5 to $25 depending on version (Basic, Business, Enterprise).