I am a little bit confused about which one I should start with to investigate further? Empirical or scientific evidence that one is more effective than the other? Both methods are praised. The differences: - William O'Neill's basic book, How to Make Money in Stocks: A Winning System in Good Times and Bad is a thicker one (464 pages), currently in it's 4th edition, fully updated to current market conditions - Nicolas Darvas' basic book, How I Made $2,000,000 in the Stock Market is a thin one, only 190 pages and hasn't been updated since the 50s or 70s? Though, I don't know if that means anything at all for timeless knowledge. Both authors have other books - older and newer - as well. William O'Neill's company also offers official learning courses at investors.com and Darvas-style trading courses are offered by his disciplines as he is unfortunately no longer with us. I need some input on which method should I choose? Darvas or IBD? A book or a course? If results are more important and I have more money than time - though not sure if it is the right approach here.