I might also compare foil and wire coils.
Hi beetlemania,
In my experience, wire coils sound slightly more lively and forward vs. foil coils. Foil coils sound a bit warmer and slightly over-damped on the bass.
Everything considered, I may actually prefer wire coils. But I think ultimately it will be implementation and system dependent. Certain system may sound best with wire coils, but others may sound best with foil coils.