Personally B&O over advanced key given that choice.
You have probably seen but there are very good reviews on both these options or here.
Advance key, brilliant, really clever, works really well, cool, but bit pointless ?
You put you hand on back of the door Handel to open instead of pushing button on key
(not really a hardship).
passengers walking to car with you can't get in much before you unless you press button on key anyway.
as I said Cool, but once novelty wares off what's the point for £425
And you push a button to start instead of turning the key with again is nice, but have had on last 2 Hondas and again the novelty wares off, them you have the keys digging you leg in your pocket, or you take them out anyway and put them in the cup holder.
i personally went Audi upgrade sound system nearly as good as b&o at lower / medium volumes (loud enough for me)
i like my music, but 700 ish watts isn't absolutely needed in a car, 180watts ish is fine for me, but for loud volumes b&o is the way to go!
hill hold at £90 is so cheap that as i have never owned a car with electric hand brake, Is a safer bet as one or two have struggle to adapt to it, and makes it a little bit easier, especially in stop start traffic, and people seam to like it.
personally I most wanted the Panoramic sun roof over all the rest of options, but some others where practical over desirable.
n.b. S Line C.O.D. Sportback Great choice ! (Same as me) what colour ?