In reply to elliot.baker:
The difference is theoretically a mix of more difficult moves (quantitively and qualitatively), more consequential positions, a more committing line and more physical and intimidating overall. However, there are different "genres" of scramble, and some may find a grade 2 gully easier than an exposed grade 1 ridge because the latter feels so consequential, or a grade 3 slab easier than a slippery grade 2 gill, because the latter is more insecure.
Being cautious is never a bad thing, but I think Milestone Gully, for example, is not really harder than some of the optional difficulties on the North Ridge... With the possible exception being when it is wet. It's just a lot less optional! You have to either go up or down - you can't avoid bits.
Anyway, your original itinerary sounded great. Hope you have fun