I like that one better, seems to have an almost glowing effect on the mane/tail now, like the light reflecting off it, 8/10. The hair slightly seems a tad off, but that's just cause it's nearly impossible to extract hair properly.. for me anyway, there's always pieces that get cut somehow.
Edit: and the color from the old background meshes with the hairm, maybe try to play with the colors of the mane a bit to make them darker?