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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I think Forsaken has stepped up my interest in D2. Not saying it's perfect but definitely has some more challenging activities than Taken King was. Dreaming city is awesome. Shattered throne was a b*tch but felt good when I completed it. Festival of the Lost in D2 doesn't feel like Festival of the Cost in D1. I can go on about the differences between both versions but I'd rather play D2 right now. Forsaken King > Taken King