Summarized %/s List

Sorry for these noob questions, but what does each column stand for and what column should I be paying attention to the most to figure out which class is the strongest?

As tecul1 said, the columns are clearly labeled. But, since saying that alone isn't very helpful, I'll just let you know that the %/s column is the one that tells you the % damage from skills a class can use, and the class column is the class that the row corresponds to. Everything else is only relevant if you want to spend a crap-ton of NX on your equipment, but 100% and 200% boss are both just hypotheticals about how much damage a class can do with that much %boss damage. Hits/s is the number of hits a class can do in one second, and that only really matters because of the m/s column, which is how much damage a class can theoretically do in one second (in millions).