Dual sink plumbing/venting options, which is best?

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Martin Caveza

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westlake village, CA
Hi, I'm new to this forum so thanks in advance for the help!

Our upstairs bathroom has dual sinks and one of them had a clogged drain. After several attempts to unclog it personally and through a plumber, I found out that the iron drain pipe in the wall was completely closed and thus needed to be replaced (50 years old, see photos A-1, and A-2).
My question is this: Is there any benefit to re-plumbing the old iron pipes by using either option A or option B? Is one version better than the other? See photos.
I've seen both options mentioned in this forum and not sure which to use. Is there a code concern? A sewer gas pressure concern? or anything else?
Thanks for the help!

Photo A-1.jpg Photo A-2.jpg Option A.png Option B.png
 
they would both a is easier to snake individual drains but more work...b is fine as long as you have a clean out above sometimes when snaking the cable will go from one side to the other
 

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