the emanage and the safc are incomparable,
the safc is garbage and so limited its bordering on useless,
the capabilities of the emanage ulitmate are huge, they are the closest thing your going to get to a stand alone system. They even surpass the power fc in some aspects as the pfc is really quite old now (for example the resolution of the tables is slightly better in the emanage ultimate) and are about as powerfull as the likes of nistune etc
Also it is possible to run an emanage ultimate without the maf using the speed/density function. You also can use it for launch control etc
The emanage ultimate will be MORE than adequate for most peoples bolt on upgrades, however when going for serious power then as always a stand alone is a much better option.
I have seen first hand many sr20's running above 400bhp using an Emanage ultimate with very smooth fuelling and power curves.
I have no experience with any other piggy back ecu so cannot comment.
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