Future or FCS fins?

Which fins are better and can you put future fins into a board that has a FCS fin system and the other way around. Im new to all this fin system stuff.
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realmripple wrote: and even rarer for damage to a fin
drowningbitbybit wrote:realmripple wrote: and even rarer for damage to a fin
I bust mine all the time
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Futures for me - you can get hold of them for a fraction of the cost of FCS fins.