>>30241699there's really no practical way to choose a metric that satisfies everyone.
look at ratio of retro vs non-retro content?
then someone who plays 9h of retro and 1h of non-retro a month (9:1) will beat someone who plays 10h of retro and 50h of non-retro a month (1:5).
some people will say yes, this sounds good as it shows who specializes and how heavily they specialize.
look at total of retro hours?
then the 10h of retro (1:5) will beat the 9h (9:1)
some people will say yes, this sounds good because this person creates more net retro content than the other.
it's still fun to look at and play around with numbers, but if you use it to make decisions, you're guaranteed to make some people unhappy.