I really hope you listen to future episodes and contribute like you have here for this one, this is great. Thanks for taking the time to be so thoughtful in your responses!
We had a classic RPG's episode (46) that I did the exact same thing on. I somewhat arbitrarily picked years... 2001 and prior, 2002 and after to define classic and modern. There's obviously debate about that but for the sake of argument, that's what I did. So for modern RPGs, I went through and noted the ranks for each one after 2002. For example, let's say on IGN #2, #5, #8, #10, etc. are all modern. I did the same for both GameInformer and IGN. After a bit, games ranked on both lists would have two numbers.
Game 1, IGN #4, GameInformer #26.
Game 2, IGN #18, GameInformer #11
For games not on both lists, I would put their number at 100 for the list they were absent from. Technically it should have been 101 but whatever.
Game 3, IGN #47, GameInfromer #100
Then those numbers get added together...
Game 1: 4+26 = 30
Game 2: 18+12 =29
Game 3: 47+10=147
Then sorted from lowest to highest:
1)Game 2: 29
2)Game 1: 30
3)Game 3: 147
Not the most scientific way to do it, but when dealing with 2 sources for a podcast of our caliber, it was the amount of work I wanted to put into it.
Hope that made sense for you!