you can almost write in your keyboard speed in landscape mode or with the bluetooth keyboard.
Most note taking apps should work in either orientation so the user can decide themselves and all note taking apps should work automatically with either hardware keyboard (dock or bluetooth) unless they're doing something very strange.
One advantage of Page is it's a full word processor so you can set styles on any word and have special formatting. One down side of Pages is it's a full word processor so there's additional clutter and it's whole focus is on one document. Something like Notes To Store (my app) you can have multiple notebooks and organize them in a way that might be more difficult or awkward in Pages.