I wouldn't say that non-MarisaB scoring is less interesting (I find SakuyaB the most interesting, since she can profit from bombing so many patterns that it's about chaining for extra resources to spend), but MarisaB without the item-generating bomb would certainly lose that unique scoring style. So I guess the overall range of DDC scoring styles would be less interesting.
The other bombs have their own distinct qualities, though the playing style is relatively similar except for SakuyaB's spell canceling (and maybe ReimuA's PoC chaining). For example, ReimuA's gohei bomb doesn't really hit the player's position, so it can be used to supergraze on top of a boss. And MarisaA's Dark Spark is a trade-off between hitting the boss for more bullet cancels, or aiming away from the boss for lower damage so you can use additional bombs on that nonspell.
...I've really put a lot of time into scoring this.
Edit:
Easy - SakuyaB
Karisa - 224,502,990 - C - 0.0% - ReplayLast-minute retaking of the DDC Easy record! It's not as polished as I'd like, though...
Easy - SakuyaB
Karisa - 228,538,830 - C - 0.0% -
ReplayThat's better. Still some unpolished collections in stage 3, but I think I'm done with this category for now. And DDC trial scoring overall, I guess. Unless I need to defend this record within the next few days...