Already at arms length, assuming you're armed with both, I'd probably say knife first. You probably don't want to attempt to immediately draw your gun when that close, but may be able to control a knife better. At least until you can get some distance. Or you may opt to keep everything hidden until you get a more favorable position. It really depends on the exact circumstances and your training.
Short answer though, whichever you have available and are most comfortable/trained with.
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