What would it be?

You can have multiple pairs of the same kind of shoes, even different colours if you like, but the style must be the same. Remember, this is the only footwear you have now for the rest of your days, so needs to be appropriate for any situation - weddings, court appearances, job interviews, as well as playing sports, climbing mountains, going to festivals, whatever else it is you might wind up doing. What are you going to go with?

Obviously the humble boat shoe is the right answer, but feel free to make your own choices.