Which canon miraculous you think would help Chloé become a better person?
Honestly, Bee was really set up to be the best for her overall growth. Cause everything that bees are tied to is all that Chloe needed to grow as a character. This Miraculous was her perfect foil.
Bees are tied to community, fellowship, teamwork, duty and responsibility, working hard, being selfless, and having self-restraint (for a bee can only sting once). Chloe ultimately needed to learn how to work with others, to be more considerate and selfless, and to actually do her own work instead of passing it off to Sabrina. And self-restraint as she easily lashed out, "stinging" very easily and readily.
Chloe essentially starts out as a wasp, and was set up to learn how to be a true bee.
But that potential went out the window when they made Pollen an eager servant and yes man, and went with "bee sting" power. Cause that's what bees are known for, stinging. These ultimately didn't help Chloe much, as the power and kwami just feeds into how she is.
If Chloe's growth was to be tied to the Miraculous, then it should've been tied to community in some way, and something that's going to have to force her to change, like the power instead is directing a magical swarm of bees that WILL unionize and leave you if you're unfit to direct the hive, and they will not come back until you change for the better. Which until Chloe makes a change and commits to it, she's going to be powerless. Also, Pollen herself would also need a huge overhaul in personality, cause Chloe doesn't need another yes man in her life, she needs someone that is going to challenge her and how she is.
Outside Bee, there is promise for her having the Horse. They are tied to being noble and heroism, which Chloe did admire heroes and want to be like them, so something like that could be worked off of. Kaalki also has similarities to Chloe, so she can be on the same wavelength as Chloe, but still challenge her and how she is as Kaalki should be all for her holders being noble and true heroes. Which Chloe is not.
There is some potential for Cat, but it could also be risky. Plagg and Chloe could be a very funny pair, how she is could practically be begging him to mess with her and have some payback. And it could also be a good destructive outlet for her. But this is also an easy Miraculous to misuse, and do we really want to see Chloe wielding the power of destruction? I'm not sure.
I can also see potential with Mouse. The little we see of Mullo has some similar appeals to Plagg in that she'd mess with Chloe and be hard to control, and her liking to prank her humans can work off some good karma to how awful Chloe is. And the power of cloning is going to mean Chloe's actually going to have to do work, and is going to set Chloe up to deal with herself. It can be set up with her literally looking in the mirror to see who she truly is and need to change, less nothing get done cause she's too busy fighting with herself.
Lastly, there is also similar appeal to her having Monkey. Monkeys are also tied to honor and strong sense of communities, and she's very chaotic so the power will be up her alley; biggest appeal though is Chloe paired with Xuppu. That kinda promises it's going to be hilarious given both have short tempers, and Xuppu is an absolute gremlin and will prank Chloe, make a mess of her life, and call out her bs.
So of the canon, these are what I would vote for, with Bee having the most promise but needs changes, and there's potential for sure with Horse, Mouse, and Monkey. Technically Cat too but that could also be risky.