Here's the details on XLR powering-
The DPA DAD6001 and Naiant PFA are essentially equivalent in function in adapting these microphones to phantom powered XLR inputs and are both audibly transparent. I use them both.
Depending on how you source the microphones, each microphone may or may not come provided with a DAD6001. Regarding form factor, both are housed in a male XLR connector, the primary difference being the PFA has a short wire "pig tail" input lead, whereas the DAD6001 has a rigidly mounted female microdot input (and an optional belt-clip).
Advantage of the DAD6001's microdot connection is direct connection from any standard DPA microdot-terminated mic-lead. Disadvantage for some applications is the microdot connection sticks out from the recorder or preamp input once the XLR is plugged in, making it somewhat more difficult to fit in a tight bag and more vulnerable to being knocked or bent if that connection is unprotected.
Advantage of the wire input is that it can "turn the corner more tightly" making it and the microphone cable less vulnerable. I cut a small slit the rubber strain relief of the XLR housing on my PFAs to allow side entry of the wire with the strain relief serving basically as rubber bumper. Disadvantage is that a microdot input is not available from Naiant. However, you may be able to send them a short cable terminated with female microdot on both ends that Naiant would then cut in half to use as two input leads - contact Jon at Naiant about that possibility. We can point you to sources for microdot terminated cables. Typical PFA input options are mini-jack or mini-XLR (maybe Binder?), either of which can be stereo, exiting to Y pig tail to a PFA pair, or mono. To use that you will need to either use a short microdot adapter cable (mono or stereo Y), or re-terminate the microphone lead from male microdot to 3.5mm mini-plug or mini-XLR, typically. I generally use adapter cables to avoid having to modify the microdot on the mic cable as its somewhat difficult soldering the very thin center lead of the DPA microphone cable reliably. I prefer mini-XLR because it is locking, and because I have all four mics connected through a single multi-pin mini XLR connector. In other multichannel rigs I use multiple mini XLRs, with each handling a stereo pair.
More details on Naiant PFAs-
They can be ordered (could? I think Jon at Naiant continues to build them upon request) with a lot of options, including things like provision of polarization voltage to non-electret condensor microphone capsules. These are the simplest of PFAs, and use a shorter XLR housing than some that other TS members require for powering other microphones. They can be ordered with other than unity gain, but if feeding a modern XLR recorder or preamp input that typically isn't necessary. Mine are all unity gain. They can be built with an output of either polarity. If ordering from Naiant, tell Jon the PFAs are for miniature DPA and that the output should be non-inverting. If not specified, he builds them inverting, as most other miniature mics seem to have a polarity inverted output, so an inverting PFA corrects for that. This not generally a problem for a single mic or pair of the same mics, but is nice if using multiple mics to have everything recorded with the same polarity.