Better in some ways, worse in others.
My understanding of Groovy is that it's closer to a scripting language, which can make it very good for certain tasks. However, from experience it can be more difficult to get Interop between Groovy and Java code - especially in the direction of Java code calling Groovy code. Kotlin emphasis on Interop is quite a big deal, and they do a lot to make calling either direction as painless as possible.
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