Or 華金? Well, either way: TGIF!
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Both characters have the same meaning in this case, so it probably doesn’t matter. I think 花金 is more common.
Jisho shows 花金 for the main dictionary entry and 華金 as an alternative, so I believe 花金 is more common, but as the other comment says both kanjis have very similar meaning so they both should be ok.