>>536155992
Taishin is the strongest due to Encroaching Shadow but she is extremely hard to build due to garbage growth rates

Gold Ship is also very good and easier to build. But has to use the White version of Encroaching Shadow acquired through Hishi Amazon Power SR or Spark

Good Umas for Long CM
Narita Taishin
Gold Ship
Nice Nature (stamina debuffs actually kill you here)
McQueen
Rudolf
Daiwa Scarlet
YOUR FAVOURITE UMA (see pic related)

As long as you try hard enough you can win with anyone (requires a lot of autism)