Manavis is a tool that charts experience gain based on all the activity in the tmwAthena server.
server.themanaworld.org publishes history for each day, which can be used to compare favoured avenues for experience over longer periods of time. Be aware that loading too many datasets at once may be quite slow. At the time of writing, the latest chromium on Freeyorp's computer strugges with more than 3-5 large datasets loaded at once.
The source is available on github.