That’s too broad of a comparison to make, foils and trons both come in a variety of magnets and winds and foils are now being sold as humbuckers which mixes everything up
I think gold foils are an odd fad, especially the boutique sets that cost more than a whole 60s Teisco. They are made of refrigerator magnets and sound like single coils that fell off the winding machine a little early, or like a Tele neck that’s mounted really low and away from the strings.
Filtertrons are awesome though.