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Without a single specification it is useless to discuss.
Voltage range, frequency range, isolated, how often do you need an output value, what resolution, what precision...
Instantaneous voltage, true RMS voltage, fake RMS voltage
***
With "voltage relative to each other"...
* maybe you just mean a differential measurement.(but maybe you mean a percentual output voltages)
Differential:
* L1 - L2
* L2 - L3
* L3 - L1
Use three ADC channels. Measre each phase voltage individualy, then subtract in software.
Or use three difference amplifier circuits to build the difference at the analog side, then feed them to an ADC each.
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