I bought the Stanley as a replacement for my old Delegate and, although very similar, it is a miles better bag for pretty much the same price.
The extra features this one has that the other one didn't are:
* Two easy access pockets on the side. I had to dig around the front pocket before to get my phone.
* Padded laptop compartment.
* Key hook. I know it's not much but make life easier when carrying things and I get home.
* Hip-strap. The Delegate used to swing around when I was cycling, this one stays where it should.
The only thing I miss from the Delegate is that it was expandable, but you can't have it all...