Af1 has a better cushioning in the sole but I wouldn’t recommend long walks in either of these. Someone already said new balance 990 v6 that’s what I would recommend, they look cool and are top 5 comfiest shoes I’ve ever worn. A little more expensive than retail price for af1’s or dunks but easier to find too. Something like a new balance 2002r is almost always available at foot locker or any other shoe store and will be extremely comfortable especially for long walks and runs about $150.