Enamel Pin or Metal Keychain? (Patreon)

I want your opinion on which you'd like better!

An Enamel pin or a Metal keychain?

Visual Examples (not mine!!) are shown below

Enamel Pin (Hard enamel, Single sided, comes with a pin that you can use to pin to things like clothes, bags, cork boards, etc etc)

https://www.etsy.com/listing/1425190852/crystal-sylveon-enamel-pin

Metal Keychain (Hard enamel, Single sided unless I can find a manufacturer that does double sided, but if it's double sided all of them might take longer to come out due to expenses.) 

https://www.etsy.com/listing/1140440073/sylveon-shiny-double-sided-enamel

Asking because of the sketches I showed in the Patreon server the other day!! ^^