Sorry to read about your dad. It's great that he has you and his wife in his corner.

I think your question is a good one.

We thought we were making an educated decision at the time we were in discussions about my husband's chemo, but in retrospect if I knew then what I know now, I would have pushed for a different option.

I thought that in this thread (copy link below) of conversation, there is some good information about Cisplatin and Carboplatin.

http://www.oralcancerfoundation.org/cgi-bin/ultimatebb.cgi?/ubb/get_topic/f/6/t/000699.html

Good luck with your decision.