Musa & Layla get my vote.

Even though I like all of them but My vote goes for Stella & Tecna...
>3. Bloom/Flora : I like Their friendship but it is very reserved kind of friendship. too sweet for me.
>2. Musa/Aisha : I used to like their friendship in season 2 & 3. But I can't remember much of their interaction during later seasons. so they are 2nd.
>1. Stella/Tecna : I have always liked this kind of friendship. I love when Stella irritates Tecna and She actually gets irritated. But They never really argue over these little sweet fights (Mostly).

as my opinion :)

Is bloom and stella😕
Stella!