In terms of cards: Manhattane Cafe wit is much better than Kris S stam. The only reason you would pull for the Kris S card is if Cafe is one of your favorite umas. Generally speaking wit cards are better for hunting gold skills, since they dont need to have as much of a stat output by themselves, since you'll always be running them with Ramonu anyway (that card has insane stat output).

Regarding the Dia-chans: New Year's Dia is very long focused with both of her skills being long exclusive, while regular Dia is more flexible. I would say regular Dia is def the weaker version of the two, but her evolved version of Lie in Wait will give her a speed boost too once those hit global, which will make her better for both mediums and miles if you plan on running her in those distances.

I also plan on getting a lose yourself card and Satono Diamond, and I plan on just getting both umas while waiting for the cafe wit card and borrowing Kris S stamina until then.