>>534923925
It depends on what you're trying to build. Golshi for example doesn't really need stam sparks, she wants speed sparks in stead because you shouldn't be training speed as much on her as other stats. Bakushin O doesn't want stam sparks at all if you only care about completing the campaign to get sparks. I also feel running speed sparks early makes it easier to get high enough stats on the other stats to try and roll sparks on those.
But in the end you really want a few 9* of speed and stam regardless. Speed just might help you more in the early game as it'll be easier to grind A-rank umas.
>how important is wit btw
Picrel, bottom part. If you run a single strong SR wit card like Marvelous Sunday, Daiwa or Agnes you'll regain more stamina running wit and you should run wit relatively often. The math is complicated but when you have rainbow training, having 2+ rainbows at once SIGNIFICANTLY increases the result because the bonus %'s are multiplied with each other.
This guy's video is a bit unhinged and all over the place and he's got fairly broken English but I found it to be very informative: https://www.youtube.com/watch?v=NG0bnF9FXVc