Prepping: Ontario RAT 1: AUS 8 versus D2 EDC Review

I've had the Ontario RAT 1 in AUS 8 steel for about 9 or 10 months and have enjoyed the knife. It's very sharp, durable, has a great fit for my hand and has become my preferred EDC pocket folder. After watching a couple of YouTube videos I discovered the Ontario is offering the RAT 1 with a D2 steel option, so I decided that I should investigate the difference in the two steels. Ontario RAT 1 (AUS 8) $34.99 https://www.amazon.com/Ontario-Knife-RAT-1-5in-Closed/dp/B008XGT3GA/ref=sr_1_4?ie=UTF8&qid=1483983006&sr=8-4&keywords=ontario+rat+1 Ontario RAT 1 (D2) $36.95 http://www.knifeworks.com/OntarioRatModel1D2folderblack.aspx#.WHOpqFxQ3h5