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

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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