Why ENIG is the most popular surface finish in PCB industry?

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In PCB Industry, there are several surface options:

HAL (Lead free), OSP, ENIG, Immersion Tin/Ag, gold plating...

But ENIG has becoming more and more popular in pcb industry. why?



ENIG is Electroless Nickel Immersion Gold ( Au / Ni ), contains two layer metallic coating 2-5 μin gold over 120-240 μin Nickel, as nickel is used as the barrier to the copper and as a surface finish.The gold protects the nickel during storage.

ENIG advantages:

Pb free
Long shelf time
Flat surface
Perfect for Plated Through Holes (PTH)
Helpful for PCBs with large BGA
ENIG disadvantages:

Hard to rework
More expensive
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