Actually I only have the mini 4; I gave the air 1 to a family member but I was able to compare with my mini 4 the other day. Anyway, you mentioned lightness wasn't a big difference, so that makes me lean towards the mini 4. I tried one handing the air 1 after having used the mini 4 for over a week and it just was too heavy and uncomfortable for me. I don't see that changing. I am really thinking that the mini 4 is the one for me, especially cause of weight.I'd rather have the mini 4 /air 1 combo than the the air 2 on its own if that's the choice. I have the air 2 and mini 3. I like having both. I prefer any option where I get to have more gadgets lol