Well.. I'm gonna be honest... I think Leanne wins in sheer breast volume and mass, and she also has a beautiful, round ass too, a rarity among macromastia models..
But who cares when Leanne's work is so painfully boring and every video of her looks the same? For the last 6 months the line-up of the videos on her site is just the same 4 videos reposted under different names.. her range of boob-acrobacies is way too low (she only shakes them sideways and bounce them up and down, won't even grope them with passion or self-suck them) and I can't remember if she ever looked like she genuinely enjoyed what she was doing....
Milena, on the other hand.. wow.. she really embraces her tits and knows way too many boob-tricks for me to keep track of.. her videos are always different and they actually have a script, Milena didn't just stand there for five minutes and split it in part 1, 3, 3, 5D, BTS, etc.it. She is willing to passionatley suck and grope her own boobs AND her guest models' tits (something Leanne would never do). Without mentioning the unmatched joyfullness and the confidence she displays on camera. That's why she wins, easily... That's why she will always remain The Queen.