Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Vancouver emerges as the optimal September destination with an overall TripTiming Index of 67/100 vs 62/100 for Banff (+5 point advantage). Vancouver experiences substantially lower visitor footfall and shorter landmark queues (moderate footfall vs heavy visitor congestion in Banff). Sightseeing is further aided by comfortable outdoor weather (17°C feels-like). Travelers also benefit from lower accommodation costs (~$322/night vs ~$374/night in Banff, saving ~$364 over a week). While Banff retains an edge in Civic Safety (93/100 vs 74/100), Vancouver's commanding performance in Space & Crowds secures the overall September recommendation.