I selected download without thinking twice.

It really depends on how desperate I am for the software, e.g. Do I need it today? Will I use it much?

Then there is the situation of is it avaliable? If I can get a second hand copy at a reasonable price I would be quite tempted to go for it, assuming it is something that i am going to make quite a bit of use of and I would like a boxed copy of it. I can be nice to have a genuine boxed copy of something. Otherwise I would just download it. Or get someone to copy it for me.