What's the difference between 点菜和叫菜？

叫菜 and 点菜 have the same meaning in Chinese while 点菜 is used more frequently and officially when you take an order in a restaurant.(我们开始点菜吧or点单吧)I think 叫菜 is more like asking for food that you have already ordered. Anyway, try use 点菜or 点单