Not meaning to be funny, but statements like this really grate my goat. Steyn is universally recognized as the best bowler of this generation, so he's not got 'the edge' on Anderson, but he's considerably better. Rant over 
Just my opinion mate, if I was writing a current team sheet for a test in England, using the Dukes ball, Anderson would be the first bowler on the sheet for me. Anywhere else in the world and it would be Steyn. In fact anywhere else in the world I'd take Broad or maybe even Finn before Anderson out of the current England set up.
To be fair, I never saw Alderman play as he was just before my time so apart from the odd Youtube clip etc. I haven't seen much of him so can't really pass much judgement.