I would have to say Ipod 5. Mainly because it is smaller and more portable. But this is just my personal preference. It all depends on what you need it for. If you are using it for long car rides, Ipod. But if you are going to do work on it, Ipad. Hope this helps, and sorry if it is too repetitive:/
The main difference is screen size. The iPod touch can be carried in a pocket, so it is handier to carry around with you. But the larger screen on the iPad Mini is good if you watch lots of videos. It is really up to you to decide which one will fit best with what you want to do on it.