What is the best four-layer PCB stackup for signal integrity?

Which four layers stackup is more favourable for signal Integrity when Designing your PCB board.
Signal, Ground, Power, Signal
or Signal, Ground, Ground, Signal.
Solution
The best 4-layer PCB stack up is considered to be

SIG+PWR
GND
GND
SIG+PWR

Sometimes it's difficult to connect all tracks using only two layers. Especially in multi power domains designs.
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