More details would help. Do you have other Chanel bags? Are you planning to get more? Your wardrobe/style is also an important factor which I assume you already counted for..
If you love the rainbow woc and plan to get more items in the future then maybe get it now. Black will always be available down the road. Good luck!
Great things to consider! My WOC is almost 10 years old and is starting to get worn-it has been with me everywhere I like the versatility of the black mini and I know that I would get a lot of use out of it, but also would love to have a rainbow as the rainbow symbol also has a lot of meaning for me!If you already have a black WOC, why do you want the black mini?
The rainbow doesn't sound like your prefered size but would you use the WOC? You do use your black one so you can make it work size wise. They do seem quite hard to come buy. If you'll find a mini you can always sell the WOC.
The WOC having two main colours makes it less rainbow but it's still gorgous. How badly do you want to hop on the rainbow train? Would you be really bummed if you'd wait for another rainbow and it won't come along?
Thank you for your feedback!If it has a lot of meaning for you, get it! (Especially since you have two black bags already.) I vote rainbow!