Currently my dad use Asus Zenbook but he didnt like it much. He's using ipad and iphone so im thinking of buying him macbook air. Is there any other better option?

1. Preferred brand : Toshiba? or Apple. Must be Ultrabook.
2. Budget : below 4k
3. Usage : Just some office usage, presentation etc. and movie, music.
4. Preferred laptop/screen size: 13' or below.