Depends on what you need. Ruby gives slightly higher damage at lower cost, while halloween princess gives you a 50% NP charge. For fast farming, halloween princess is better, and since that's what most people use her for, it's the one that gets recommended. However, for longer, more drawn-out fights, especially when you want to use good CEs for other servants, ruby will be better both for it's better damage potential and its lower party cost.
As for better CEs, depends. If you have a decent crit setup for her, joint recital might be better, and holy night dinner, which we will get for this year's Christmas event will be best. If you don't have a reliable way to spam her NP, limited zero over is best. There are probably others too, but others could help with that.
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