I find myself generally in agreement with Joel_Cairo. I think when I started out I wanted frags to have a lot of duration. The "bang for the buck" argument held sway with me.
Now I have a ridiculous number of frags. It is on hot summer days that I have the opportunity to enjoy a number of them ... they just burn out. I think yesterday (or the day before) I wore Caron PUH, Acqua di Selva, Monsieur de Givenchy, Chrome, Kouros Cologne Sport, and Photo. Oi!
There are times (especially when working) that I'd prefer something with a longer life though. Reapplication can just get in the way of work.
I think with short-lived, linear frags switching between frags might be easier. I'm more inclined to enjoy the development of a non-linear frag and hope it lasts on my skin so I can appreciate it.