Both are good and bad for different reasons. Destiny is buggy and lacking in content and story.
Borderlands has lots of story and loads of content, it also is much more viable for farming. But it's basically a re-skin of the old game that could've just as easily been a dlc at full game price.
FYI I've played both and love both as games so I want them to be seen as equals.
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Now that's an opinion we all can respect
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Fair enough although id never put Destiny on the same level as Borderlands