Quote from ztkingWanted to let you guys know that I have kicked off a data-gathering effort to determine this. Here are the details (from main d3 forum):
I have a spreadsheet setup. I'm gonna have to trust people not to wreck it and I'm going to leave it open for public edit.
Play a night and take a screen cap of every piece of ilvl60, 61, 62, or 63 armor with a single resist on it (lightning resist, physical resist, etc). After the night, hop on here and just fill in your drops from the screen caps. Won't take you but a few minutes. Single resist are extremely common (on something like 70-80% of gear, I think), so it shouldn't take too long. I have the charts all up and ready to go, but they are meaningless until our sample size improves.
Who will help me? Let's end this debate. What we're looking for is a trend that says the affix rank distribution from gear from Act 3 and 4 are better than the distribution of affix ranks from act 1.
Wanted you to be aware and extend an invitation to contribute if you're interested.
Awesome, its looking really good and hopefully will produce fruitful results. I will participate in this project and will be collecting +resistance information In Act 1-3 depending on what act is actually farmed that particular day. Thank you