after trying 3 kind of farmer, this is my review:
-archer SR3:
fastest killing speed,
need good pistol, high dex and fast ping
-corsair3dopel:
DPE+silver/gold mob=2x everything,
can steal world boss cube and rare item with max 15% chance of success from corsair 3 pillaging
best option: kill enemies with fast multihit weak attack
once you stole something from enemy A, you cant steal again
corsair can steal silver/gem/rare item/cube/card (left to right, most common to least common)
-linkthaumFF:
double everything that get swelled by thaum
late game bloomer, the hardest to solo leveling between this three
cheapest investment between all three
most of the time you will wait for joint penalty CD before you continue farming again
btw, farmer arent suitable for ET unless you have very strong weapon with high transcend