10 is much better,thwt 5% isn't much

What do you mean by that question? Are you saying since you're doing lottery, I need bond CEs like Chaldea Lunchtime and Detective Foumes or are you saying since you're doing lottery, you got so many mana prism that you can now buy whatever CEs on the shop? Purchasing Chaldea Lunchtime right now is fine if you're doing lottery for bond but if you just want to buy something because you have so much MPs then just buy Detective Foumes since it's limited unlike Chaldea Lunch which is available indefinitely so you can buy whenever you feel it. So basically, Chaldea Lunchtime can wait.