From what I've read it would appear that trainers are the preferred option for the Via Podiensis. However, I understand that the route passes through rocky terrain on some sections and in this situation I would normally wear relatively lightweight boots for ankle support. I do quite a lot of hill walking on rocky Mediterranean paths in Catalonia, where I live, and always wear boots and use trekking poles. So I'm in something of a quandary and would appreciate any advice on this question.