The 12" MacBook Abomination was a short-lived, badly-designed, performance-limited computer. Apple doesn’t sell them anymore, and modern Airs are very respectable computers.
First place, obviously, goes to the Toshiba Libretto.
https://en.wikipedia.org/wiki/PowerBook_Duo https://en.wikipedia.org/wiki/PowerBook_2400c
Wow - how was I impressed with a laptop "only" weighing 2kg?!