>>536874932
start by narrowing down which umas that you can or can't grind by doing daily legend races. mine were manhattan cafe, mr. cb, dream journey, transcend, durandal and loves only you. I can grind (still am) for the first two so they're out of the picture.
If you have 2 umas left then you pick the one you like more or do a coinflip if you like them equally. if you have 3 or more.. i used a hunger games simulator and let them fight it out on who gets to be ticketed, dream journey won