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It really depends on how important hitting max fps on your 120hz monitor is.
With a 120hz monitor and a 2080ti personally I would take the 9900. Average frames are similar on 3700X but the 1% and 0.1% lows are way behind in some games. Wouldn't make any difference on a 60hz setup but does on 120hz.
I have a 3600 but considering changing to 9900 for this reason (I have a 144hz and don't mind lowering some settings to hit max fps)
With a 120hz monitor and a 2080ti personally I would take the 9900. Average frames are similar on 3700X but the 1% and 0.1% lows are way behind in some games. Wouldn't make any difference on a 60hz setup but does on 120hz.
I have a 3600 but considering changing to 9900 for this reason (I have a 144hz and don't mind lowering some settings to hit max fps)