The only way to settle this is that I send the original negative to each of you , and see who returns the best print... just kidding. The real beauty of this is that I think you are both right.
I take out of this that there is many different procedures and lots of different equipment that I don't have. I agree with putting filters under the lens in the lightpath may cause image degradation (particularly with used ones in eBay) nor can I invest the money in sophisticated tools so I have to do with regular enlarger. So I will probably try both approaches somehow with the tools I have and see which one works best for me.