Specific differences between AP and bridge modes?

I've RTFM'd everywhere but cannot find anything definitive regarding the differences between AP+client versus bridge+bridge modes.
Presume you have a pair of AP1200's. First test case: One is in AP mode and the other is in WGB mode. Second test case: One is in root-bridge mode and the other is in non-root-bridge mode.
In both cases traffic will pass bidirectionally from one Ethernet port to the other. What, then, are the technical differences between these two situations? Do the "bridges" place less load on the AP1200's CPU? Does AP-based operation yield more diagnostic data? What are the advantages and disadvantages of each mode?
I can't find anything that digs into the details. Any help appreciated. Thanks!

Thanks for your response. A few comments, and then a question:
* Looks to the AP just like a standard client, so it interoperates with all APs
What does? A 1200 in WGB mode? If so, then yes it looks like a standard client to the AP but Cisco explicitly states it will only associate with other Cisco AP's. It is not compatible with "all APs".
If you mean a non-root-bridge looks like a standard client to an AP, that's true but the AP must be in "AP with wireless clients" mode which is not one of the test cases I was asking about.
* No configuration required
Of the WGB? Mine need configuration: SSID, encryption keys, etc. It's just like setting it up as an AP except for the mode you select.
Of a (non-)root-bridge? Mine have needed configuration in that mode, too. Same as above.
Not sure what you mean by "no configuration required".
# Disadvantages:
* Supports only a single wired client
Nope, in WGB mode pre-1200 units supported up to eight wired devices. 1200's and later support up to 250 clients. Cisco docs are clear on this.
In bridge mode I'm not aware of any wired client limits. The device is simply passing traffic between the two interfaces.
* WGB itself is not manageable
Not sure what you mean by "not managable".
Back to my question: What is the difference between AP+client mode vs. root-bridge+non-root-bridge mode? Does the AP+client mode make more decisions about traffic routing or prioritization, while bridge-based operation is less "intelligent"? Something else?
My tests show no discernable difference in throughput, even with multiple clients/nonroot bridges. When multiple users consume bandwidth simultaneously, it is shared among them just as you'd expect.
So... what ARE the differences, as far as the decisions IOS is making, between the different modes?
Thanks!

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