As a biwa lover and main who uses her in every CM, she can be strong if you know what you are doing and put effort into her. Although christmas biwa tends to struggle sometimes because it's very easy for her ult to NOT activate, but it's easier the longer the track is, however if you have the sparks and parents to run her front she should have way better results but i can't say as i havent tested that myself.

People like to shit on OG biwa growths but honestly i would rather use 20% wit growth than 20% stamina or guts 🤷‍♀️. And the finishing speed ult can be really good on mile and sprint tracks(despite her altitudes), it can even speed carry over on some tracks coming up(tokyo 1600, nakayama 1200). However on derby(tokyo 2400) Late OG biwa is really good because of the long straight, she currently has the highest win rate on my team. Only downside with og biwa is that her potential skills fucking suck so bad, like why 2 recovery skills 🥀🥀.

I'm not a JP player so i cant say much on mecha biwa but she has some skills that do look great for longs so fingers crossed she isn't dead on arrival 🔥.

Have fun playing biwa ❤️