I prefer Sarada over Boruto because she is nowhere near as bratty! It is true that she was pretty rude to Sakura in chapter 701, but in general she seems to be polite and kind to people as seen by her interactions with Chouchou, Mitsuki, Naruto and even Boruto to some degree. Boruto on the other hand is just whining every 5 seconds "Boo hoo! Why can't daddy play with me!"