I use a Sampson meteor USB microphone that is fed through a USB hub to my computer. Everything works fine. If I was in your shoes and there is no difference between the computers except the parts, I would choose the one with the most ports. The USB hub will not make any difference at all. I have tried probably five microphones through my hub, with no difference whatsoever. I even tried some earbuds with a TRRS tip-ring-ring-sleeve plug into a TRRS-to-USB adapter to plug into the USB hub to plug into my computer. None of the links made any difference at all to Dragon.
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Win10/11/x64, AMD Ryzen 7 3700X/3950X, 64/128GB RAM, Dragon 15.3, SP 7 Standard, SpeechStart, Office 365, KB 2017, Dragon Capture, Samson Meteor USB Desk Mic, Amazon YUWAKAYI headset, Klim and JUKSTG earbuds with microphones, 3 BenQ 2560x1440 monitors, Microsoft Sculpt Keyboard and fat mouse