Truthfully I haven't played the pre-sequel. Borderlands gives you more loot, but most of it isn't useful. You do grind, maybe not for better loot, but the boss fights are a grind.
[spoiler]I really liked Borderlands, had fun with Borderlands 2 until it became boring for me.[/spoiler]
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Boss fights in borderlands are fun and don't feel as scripted as destiny so I don't really consider them a grind