"personally" i tend to hold onto units that have 5 star exclusive skills (Distant Counter, Swift Sparrow, etc...) just because they are so hard to get and you never know when you'll acquire another unit down the line that could really use one of those skills. It really comes down to preference though, if arena is going to be your primary goal than merges will probably be more valuable to you but if its not than having those rare skills available to build with is never a bad thing.
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