The question is not which city is better
Kyoto and Osaka are close enough that many travelers treat them as interchangeable bases. They are not. They create different mornings, evenings, hotel choices and day-trip patterns.
The better question is: which city makes the rest of the trip easier?
Choose Kyoto when culture is the core
Kyoto is the better base when temples, older streets, early starts and classic atmosphere are the main point. You save energy on the days where morning timing matters.
The tradeoff is price, availability and evenings that may feel quieter if you actually want food and city energy.
Choose Osaka for evenings, food and value
Osaka is the better base when you want easier evenings, stronger food energy, often better hotel value and access to several day trips.
The tradeoff is that early Kyoto mornings become harder, especially in popular seasons.
When to split the stay
Split the stay only when the trip is long enough that the hotel change pays for itself. On short routes, one more hotel move can create more friction than it solves.
When to get personal help
Personal planning is useful when Kansai needs to cover culture, food, children, day trips and a limited number of nights. The base choice can make or break the rhythm.