Copper coil inductor vs. round core inductor

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The one and only
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Obviously the ones with cores have lower resistance. An
inductor on the order of 2 mH witha big iron core is good to
5 or 6 amps DC in my experience before it starts saturating and
losing inductance. The air cores don't saturate, but they can
get pretty hot unless the wire is really thick, like 12 Gauge.

I'm not really certain about the advantage that foil is supposed
to give, particularly if they're just being used as power supply
filter chokes. They look good, though.
 
The copper foil inductors are pretty much solid masses of material - far less prone to magnetostriction than round wire inductors. You don't want magnetostriction in your magnetic components if high SQ is the objective. Magnetostriction introduces additional frequency dependent losses on top of those due to skin effects as well as mechanical resonances into the inductors's sonic signature.
 
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