Android 8 vs 16

Android API version 8 means the popular 2.2. There have been 9 versions after that and now the latest is at 17. See here for the version history. Android is changing frequently! Ooh, it is named after delicious-but-high-calorie things alphabetically: Cupcake, Donut, Eclair, Froyo... Ice Cream Sandwich

Which one you like better?

The one on the left is version 8. (2.2). It has buttons that looks like buttons (with various gray gradients). The "Toast" also has rounded corners. The one on the right is version 16. (4.1). Ok, the modern UI features FLAT buttons, and RECTANGLE Toasts. Come on it doesn't look as nice. I thought only Windows make things uglier with subsequent releases.