The unnotched skates will develop a flex crease, which is obvious. The notched skates won't develop that crease. (Assuming the stock boot fits properly)
Nothing stops breakdown creases from showing, but if you don't have a flex notch, they'll be less noticeable. Think about it: you get notchless skates and they develop creases during break-in. You continue using them for some time and they start to develop breakdown creases. How can you tell the difference between one type and another? It's difficult to know which is which. The break-in creases will be from the edge of the boot where the throat covers the tongue and a little further back. A breakdown crease will appear between the ankle and the stitching around the eyelet/hook throat. However, skates can break down skates without showing a single crease if you're not a knee-bender. Another note: if the skates are too big/wide, they can develop huge creases from the edge of the boot back past the ankle in no time flat. This is especially true of vinyl skates.
I noticed in the show off your skates thread that you'd gotten these skates recently and I'd love to know your thoughts on them so far. Have you ever had them before? What made you choose them versus another brand or model? This is perhaps another topic or more appropriate for a PM, but I'm very interested!
Rather than hijack this thread, I started a new topic.