I'd recommend the mixer.
I thought that an audio interface would work, and got a Behringer UMC202HD. Not a high end one I understand, but...
All I wanted was to be able to record quality audio with two mics.
The audio interface I find is no different than having two sub powered mics plugged in to the PC.

Maybe you'll have better luck with a more expensive audio interface, but the preamps on the Behringer were supposed to be decent and I find the volume of either a dynamic or condenser mic is way too low. Regardless of phantom power.

I think there's a reason most info online focuses on mixers, and I think it's because they are the best option.

Good luck! I wish someone would have steered me towards a mixer first.