Interesting question but I am long past AOW but would like to take the fundies class, it would truly be an advanced class.
I'm late to this party, but I don't agree with this statement 100%.
First of all, for practical reasons. A dive op in some resort or other is going to be looking at your *qualifications* for insurance reasons. If you have Fundies but you do not have AOW then you could be treated as a OWD due to insurance concerns. The reason being that Fundies doesn't *qualify* you for anything outside the GUE system that gives an operator anything they can use to cover their ass with insurance. Some are more strict than others. Your limitations will depend on that.
On the other hand, that's not to say that Fundies is a pointless course. I haven't taken it myself (for full disclosure) but I have witnessed it being given from close quarters and I think there can be no doubt whatsoever that if you have taken fundies, even if you did not "pass", that you will be a better, more aware, more alert diver for it.
The differences between these courses make it hard to compare them. Fundies takes a limited number of topics and "goes deep" on them. Buoyancy control is one of those. Gear is another.... and what new(ish) diver wouldn't benefit from that! AOW takes a broader/more general approach to the theory and a (much) shallower approach to in-water skill. It's really a case of apples and oranges. They are totally different courses designed to achieve totally different goals.
...Which leaves the question, what should the OP do? My answer to that would have to be "it depends". AOW is a gateway course that qualifies you to make deeper dives and opens up options in terms of electives that will "qualify" you (on paper at least) for certain activities. This has value. Fundies will take any creases out of your buoyancy control and introduce you to a mindset that could have great *continuing* value to you as a diver.
If you can afford them both then I would say take them both. If you can't then take AOW but make it a policy to dive with much more experienced divers for a year or two.
R..