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Both are 2nd-century AD Roman amphitheatres, both within an hour of central Antalya. They are very different visits. Honest comparison from someone who has driven guests to both 200+ times.
Day 1: city and the falls. Day 2: ancient ruins (Aspendos + Perge + Side). Day 3: nature (Olympos + Chimera fires). Realistic, locally-tested, no rushed half-stops.