Isn't fewer tons just a result of fewer conversions? Seems like they are the same stat in this case.I only mentioned the bowlers as in extra ones they each had to face compared to the other. I disagree re: tons and conversion rates. Especially with both being openers and Turner being a batsman that was less aggressive than Richards I’d say his much higher rate of tons and conversions is quite an important factor.
Even in timeless cricket, I don't think it's a meaningful measure except so far as it's reflected in your batting average. A hundred may, or may not, be better than 2 50s.
Even if you think there is a difference, the shorter the time limit you go to, the less meaningful these numbers will be. 3 days is short if you want a result, with a lot of innings becoming more like ODIs than tests. And if you want/can only get a draw there are a bunch of permutations on what constitutes a good innings outside of run scoring with things like pure survival or bonus points involved. Or innings just being meaningless.