I am going to rank all the Winx's (Including Roxy) Season 4 Believix transformation outfits from worst to best.
BOTTOM 3
Roxy, Aisha, Musa



Whew.. Love these girls but wow this is not ... great! Aishas wings very much carry her outfit, top half of her outfit is actually quite nice but them pants a MESS. Musa's is if very much party city 80s workout instructor costume.. can't stress that enough, while her hair and wings are very nice, its just ugly to look at and tacky (in a bad way).
Roxy's is actually the best out of these 3 but its just kinda boring for me but its not horrible like the other 2
HIGH(er) TIER
Stella, Bloom


I'm in a like to love relationship with these 2 outfits, there's something up with Stella's that I just can't wrap my head around, maybe the colors? Bloom's is really nice, the pastel pink and blue works WONDERS on her.
TOP 2
Tecna, Flora


THE TEA, THE GAGGERY this is what Believix to me is, it represents the characters perfectly, colors are amazing, everything is just so ughhh!! I love!
BONUS: TRANSFORMATION SEQUENCE RANKING
1. MUSA The dancing, the colors, how she gets her wings, her hair, loveeeee
2. Flora Her sequences always gave this elegant, gentle almost feel to it that it's so amazing to watch
3. Stella It feels kinda Sailor Moon(ish)?? Love how she gets her hairdo
4. Aisha The first part where the water rises to her foot is so magical really, but it kinda fell flat near the middle
5. Bloom Not gagging, not screaming, there's literally nothing special here at all tbh.. its just her flying around

6. Tecna Just a whole lot of flashing and electricity...
7. Roxy Just doing acrobatics with a trillion butterflies around her