Sized v OSFM Cloth Nappies

[Summertime]

Hello,

I need your help in deciding what route I should go for cloth nappies for my daughter. She is 6 months old and we are just starting with part time cloth, she is long and skinny.

Just wondering what is everyones opinion on the best way to go? Sized or OSFM? (Looking at Jazzy Buttz, Itti Bitti).

I have some Green Kids but they are quite bulky on her and spread her legs apart. I have been stuffing them with Booroi Prefolds.
Also have some sized Itti Bittis that are good.

Thanks!