Well, depends on what you prefer, more money or more FP (tho we're not talking much FP). Mona is definitelly THE CE when you want to farm money... if you farm.
Teatime. Have MLB'd Teatime and MLB'd Lunchtime on every mission you do so you can accumulate BP as fast as possible. More BP = more SQ. Farming QP used to be a pain but thanks to the Extreme Node it's a lot easier now.
@Otakon7 that's true but I did mention use both Teatime and Lunchtime. That's 15% extra BP plus more if he has others. You're going to get 1000+ BP on the highest difficulty types of nodes.
Moms Lisa, because QP cost for exp spend and skills are expensive depending on the rarity of each servant. QP are used for other things too. Unless your intent is to farm bond CE’s, I’d say go for Mona Lisa.