Well, it really depends on what you find most important in your playstyle....all I can say is that the LP Dragon buff is ALWAYS usefull. So if you're not confident over your choice, take that.
Well i am lvl 20 i got the quest dragon wish already, and i have 130k so i dont need zenni..
But they have the dragon buffs: Constitution, Dexterity, Energy, Focus, Soul and Strength..
I dont know what most of them mean.. I know Dexterity thats dodging and such and Strength is power but the rest i dont know yet so i dont know wich to choose..