Zipper Question

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This is a question for anyone who has used zippers in their crafts....

I am looking into buying some zippers to make cosmetic/coin purses and I was wondering if there's a difference in the types of zippers that are out there? I keep finding YKK zippers. Are these any good? Also what type of zipper should I be using? I have found skirt, invisible, metal, etc. types. Any information you could give me would be greatly appreciated!

Thanks in advance.