You change horses in midstream because the one you are on can't make it.  If the one you change onto can't make it either, you're an Idiot.

The new horse is no better than the old horse.

Now, WHO'S IDEA WAS IT TO CHANGE HORSES?  Not the shareholders.  It was some Idiot.

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"A" is 'probably' not good enough. "B" 'might' be better, and 'might' be good enough.

Best Answer?  1. "A"

                              2. "B"

                              3. "A + B"

Logic is usually simple.