Bananagrams or scrabble

[mushpea]

which is best??
want to get one of these to help improve my sons spelling and to play as a family,, he has ADHD so has a short attention span but really gets in to games so thoug ht these would be helpful to him but after reading reviews on each I dont know what one to get
so if you have either or both of these which do you recomend

[Gherkin]

Have played both but we are a Scrabble family and I think the rules of Scrabble are more straight forward.