While I agree with Recks that Sumo and Knights of Marines are the best picks, Starry Night, Fondant and Victor of the Moon are all also good picks for CEs to level. Royal Icing is also a decent replacement for Sign of Smiling Face for arts loopers that need a bit more refund help than damage.
Do you not have an MLB Aerial Drive? Because I’d recommend it over anything in this image save for Sumo.
Also, if you level it, Victor of the Moon mostly obsoletes both Joint Recital and Limited/Zero Over due to its greater attack value. Similarly the Christmas Lotto CE this year is probably better in most cases than KoM if refund is a concern, but that’s also like 8 months away.
My final comment would be that no split stat CE is worth levelling since the cost for 1k attack is almost never worth it.