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Like I said, though, Gold Rush is outright better than Fire Sale if you can only have one of the two. It's simply better in a mathematical sense; you save a greater portion of your income with Gold Rush than with Fire Sale.
"That is why war is so tragic. To win means to make victims of your opponents and give birth to hatred." - Kratos Aurion, Tales of Symphonia
Hmm... that's right. Fire Sale would have to give a 9% discount for them to be equivalent. I believe force powers are additive and not multiplicative, so not even Kanbei would benefit. And Gold Rush would still better from a (S)COP perspective, since damage to your more "expensive" units would fill your meter faster. It would also be superior for those powers that rely on your bank roll (Market Crash and Power of Money), or those that fix the discount rate (Hachi's CO powers).
I suppose COs that can raise money in ways that don't involve properties might prefer Fire Sale. The only one I can think of off the top of my head is Sasha and her SCOP (War Bonds). But who ever uses that?
Ah yes, it looks like you're right. Aside from Colin, Gold Rush is better for every CO. For Colin, Fire Sale is better, since his units are already so discounted anyway. This is of course assuming the FireSale discount is additive with Colin's default discount, so that he gets to buy units at 28% overall discount. For Hachi, both are about the same. Although I suppose Colin and Hachi would probably want both anyway (and maybe even the other unit discounter)