Destiny 1 has more content that is better implemented, and with better quality.
Like quests, bounties, triumphs, subclasses, gamemodes, weapons, rewards, loot, Eververse, and etc.
I suggest you play the game itself, and really understand why its better.
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In destiny 1, what you did mattered. In destiny 2, what you do is dictated by loot drops. I prefer the destiny 1 method of acquiring loot. I miss grinding strikes for drops. No reason to do this in d2.