I like for my 4 main teams to be close to same speed and was using a bronze +20.
Gold one is better so now using it, but wont max it. Cant use a +50.
Cant use any of the new girls, I have Lantana sword.
If you dont, then you could find Choco useful on some of high lvl stuff as long as shes not a main fighting unit.
Wonder what made them make another one after 3 years?