With Generation 7 being announced, Rowlet seems to be the more popular of the three. Litten being a close second.
Based off of N-Kins sprite found here:- http://n-kin.deviantart.com/art/SM-Starters-608192026

Many of the perlers I make can be found on sale in my wifes Etsy store. https://www.etsy.com/shop/KyuteSuits