Best way to farm in order to make most money is know as skimming: hit twice, wait for your regain, the hit once this method works for dance, dance pays better than fight if you skim. However, fight pays better when your sp'ing.
Sp'ing=self pinning: using all your energy up from full energy to 0. Why does fight pay better? Well dance uses 6% of your energy per hit, which means 100%/6%=16.6 hits per unload rounded up to 17 hits.
Fight drains 5% per hit, 100%/5%=20 hits. Also the fight plunder decrease rate is much lower than dance, what does this mean? It means fight plunder has a higher average than dance.
What's the best target to farm? The highest stat player that you can hit. The stronger the play over you is the greater the pay out per hit, but makes it harder to win each time.