Zippy Coin Purse VS Pochette Accessory? Please Help

The two items are totally different. I'd get the one you would get the most use out of.

For example if you are looking for something to keep your keys, compact and lipgloss together then the ZCP isn't the best choice. Likewise if you are looking for something to hold money, the pochette is rather large.
 
If I were to get a ZCP, it'd be in vernis. Given this, my vote is for a pochette accessory! I use my mini stamps pochette as a wallet, but if you ever want to use it on its own instead of in your speedy, you can! Versatile so my vote goes for that