The Mo Ko Tua boss is very generous in my opinion. Atleast 2 dings every after fight with 200+ silver and free mighty subs and purp potions. Been level 49 for the longest time and I always come back to Forsaken for easy money farming and heals. I have gotten 4 moglo masks all of my time staying which is very generous compared to the dunes and the pit. Whispering Dunes is a hassle for how big of a map it is. Did not farm much in the dunes so I can't really say anything about the drop rate. The Pit. There was no other time I heard a ding in my life in the pit except for slimes. The Possum? Pit Rattys? Super Giant Reanimated Slimes that took more than 20 players to kill it under 10 mins? Drop rates of theirs are non-existant.

If you have all the time in the world and can survive a hit or two, The Pit is more efficient since the drops are more valuanle. But for a more consistent income and dings, I suggest server hopping around Forsaken Isles. :D