Made that exact transition in reverse, from the diver on a steel bracelet to a ceramic sub.
Both are beautiful watches and a pleasure to own. In my opinion the AP is a league ahead in terms of design, finish and feels a special watch.
The major drawback and something you seem to have considered is that it feels delicate in comparison to the Sub and due to its size, is a magnet for door frames, tables ect. There was many a time I was scared to look after hearing a 'clunk'!
I have noticed that Sub prices are getting to the point there is little in it and have been seriously considering going back to the AP, if I do then as per your post, I will also find something more easy use on a day to day basis that I don't have to worry about.
Both great but the AP is something above in my opinion!
Best of luck with your decision.
Iscb
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