Oh!
I think that’s a highly complex question which cannot be answered with “this” or “that”.
Depending on many different factors like the road surface, the required ability to climb uphill, the desired grade of comfort, the size and also weight of the rider, leg strength and so on it’s highly recommended to configure tyres and their sizes for each user individually, I’m sure.
Please try the forum search to find several angles of sight, maybe first the words:
tyre, tire, Kojak, Innova, Big Apple, Kenda, Marathon…