Personal choice really...900/500 500/900 either or you will still be able to dance a farm. And make same amount of cash
900/500 dance plunder higher than other stats 500/900 fight plunder higher than other stats (but second one not suit for war)
Even builds are easy to pin. I have the 909/577 build and it works out great for farming and my plunder on dance is over 70mil first hit (though I don't like to dance much).