Want to know the pros and cons of Appian Fitnesse and Appian for cucumber

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Want to know the pros and cons of Appian Fitnesse and Appian for cucumber 

Which is best suits for Appian test automation ?

Are any challenges with Fitnesse and cucumber ?

I also read that Appian fitnesse requires upgrade for each Appian version upgrade but its not with Appian for cucumber . Please confirm.

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