Originally Posted by Sound

Ok that's make things a little more complicated
Which is the best stage to farm the medals,i would assume Pierce 5 but since i may not be able to clear that,so pierce 4?

I would honestly not suggest trying to farm them for now until you get your girls stronger. That said, pierce 4 will give more medals than slice 4 (216 vs 150). Pierce 5 gives 288 for the same amount of stam however, making that a lot more efficient.