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I have both -- one 3900X (water cooled) and two 3700X (one water cooled, one on air - Noctua NH-L9a AM4). Ultimately it comes down to fine-tuning voltages, making sure BIOS versions and chipset drivers are current and using the Ryzen balanced plan (I found no benefit with the 1usmus plan). I've felt like the 3700X has been harder to pin down an appropriate voltage to get acceptable temps, but it's somewhat of a struggle with both CPUs. I'd go with the 3900X, though. Slightly faster, more cores, only about $140 more (3900X is $449.00 on Amazon right now). The Asetek cooler should do fine.