I'm on a rather nice machine but its 256GB SSD is going to get changed up to 500+ because it's getting cramped. But I have Visual Studio, Android Studio and more installed so the stock 256GB is now less than 100GB free and my old laptop was 512GB SSD.

The 15 inch is my go to size for work but as you can tell, for me the storage is light. And with the Apple you can't change this later on many models so you have to know what works for you.

I wish I could tell you which is the right fit but can't.