I'm going to have to say zoom. For most people (me at least) a lens for close ups, sports, portraits, and landscapes just isn't practical. I don't have enough money to drop 3k-4k on glass. My goal is to have 3 lens. 50mm (or 100mm) macro, 18-55mm, and 70-300mm. That covers just about everything and within a reasonable price.
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"99% of the time, a fish tank with plants will fail. Once you start a dedicated planted tank with fish, then you begin to succeed." - Geniusdudekiran