Like Pyrohmstr said, don't go for the iPad if you want to draw. An iPad is something you should consider if you have the money for it and don't have priorities on other things. Me myself have an iPad with Procreate and Paper that are great apps for drawing, but just for those simple and quick drawings since it's not that accurate.
An MacBook Air is actually not that bad. Ok, it doesn't have a graphics card, but it does have a SSD that improves the performance big time.