Resistance to induction

We are looking at investing in a vacuum casting machine for casting

The perfect unit would have the following:

5 inch flask capacity for casting large bracelets.

Single phase electrical requirement, so we don’t have to spend $5k
on a transformer.

Pressure over Vacuum to compensate for altitude (7000 feet where we
pull 23 inches mercury max.)

Cover or forming gas.

Reasonable price.

It seems that many of the units that include larger flask capacity
and pressure over are induction units (instead of resistance). I
understand that many gold alloys need to be mixed well to avoid
karat drift, and that the induction process mixes the metal during
the melting process. What is not clear to me is if there is any
advantage in using induction vs resistance when casting sterling
silver. Opinions please.

Thanks Marty