actually I think white girls have better ass than black girls...99.99% of all black girls do not train and eat donuts and are ghetto...thats sad. They get attention for having a fat ass bcz lots of guys like fat ass so they don't have any reason to start to workout...what the white girl lack is ratio, lot of white girls have wide midsection...and the problem with black girls is they fucking grow all their life...just getting bigger and bigger...a lot of them have bad skin aswell...due to shitty food and no workout 
Well well, not an easy question...
Don't forget that the best thing is not good ass, but also a respectable waist-hip ratio together with that.
Ass/hips + the waist/hip-ratio is like
Gin + Tonic,
Ketchup + Mustard,
DP + His god damn Kitchen ,
Goodrum + Homowrecking with Kielbasas,
Marty + Kale Greens,
Poz + Tbombz etc
Goes hand in hand
