I tend to use the top one so we have a record of the actual credit, though would never object to the 2nd option.

Option #2 for me, mostly because of the horror-scenario that's bound to occur otherwise, which is that there will be cases where the "credited as" value will be the most-credited form (like when it's their only credit), in which case "credited as" really can't be used, and we'd be stuck with an actual entry in the "Marilyn and Alan Bergman" form. 

Out of interest, I've had a quick look in the CLT, and it doesn't show a single entry for either combined credit, so for these particular credits, it seems nobody has ever gone for option #1 yet.

Quoting T!M:

Quote:
Option #2 for me, mostly because of the horror-scenario that's bound to occur otherwise, which is that there will be cases where the "credited as" value will be the most-credited form (like when it's their only credit), in which case "credited as" really can't be used, and we'd be stuck with an actual entry in the "Marilyn and Alan Bergman" form. 

Out of interest, I've had a quick look in the CLT, and it doesn't show a single entry for either combined credit, so for these particular credits, it seems nobody has ever gone for option #1 yet.

I don't think that's an issue in these cases, as we aren't looking at a single name, just a single credit and the rules tell us to look at the credited name. In this example the credited names are Marilyn Bergman and Alan Bergman, they've simply been merged into one credit.

Quoting T!M:

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Now, you see, I'll buy that, but rest assured there will be someone disagreeing with that point of view, and generally, that someone will just happen to own the one profile where I'd try to put it into practice...   

This made me 

Quoting T!M:

Quote:
Option #2 for me, mostly because of the horror-scenario that's bound to occur otherwise, which is that there will be cases where the "credited as" value will be the most-credited form (like when it's their only credit), in which case "credited as" really can't be used, and we'd be stuck with an actual entry in the "Marilyn and Alan Bergman" form. 

Out of interest, I've had a quick look in the CLT, and it doesn't show a single entry for either combined credit, so for these particular credits, it seems nobody has ever gone for option #1 yet.

Good to know we don't have any "Marilyn and Alan Bergman" credits yet. I believe they nearly always work together and are credited jointly, so as you point out, a literal CLT count could yield bizarre results where they're each more credited as their combined name rather than their single names. Fortunately the poll results and your CLT results show that users are able to see these as individual credits. 

For me, it depends on the credit.  In this case, I would credit them as individuals.  If it were a credit like The Pang Brothers or Neveldine/Taylor, I will credit them as such or use the 'credited as' feature.