What advantage does the FW official charger has over the aftermarkets?

Having a mains cord from the wall to the transformer makes it easier to travel between UK & EU. Just swap the mains cord. The wall port styles require complete replacement.
I’m going to use a dock station of some sort at home, and a power supply elsewhere, so a multiport charger that will manage my phone +/- other gadgets appeals.
Not rushing, because my old laptop charger will manage 45W. My Dell TB3 might do, I’m waiting till my FW13 actually arrives.

Possibly this 4-Port GaN Charger 108W, x2 USB-C PD, x2 USB-A | Belkin
I would prefer 4 USBC ports - and buy custom cables for devices for which manufacturer only supplies USBA. Also phone requires QC (Qualcom quick charge) and I don’t fully understand how that relates to PD

Do they (60W and 180W) have PFC(power factor correction) like any other laptop power adapter?

The 180W one does probably have PFC.
Mentioned here Framework Laptop 16 Deep Dive - 180W Power Adapter

And if i recall correctly i once measured my 60W FW Adapter with an energy meter and it does NOT have PFC (I can measure it later today).

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The 180w power adapter does have power factor correction.

The 60w adapter does not as it is very slightly below where PFC starts being legally required in the EU (75w from the wall, after accounting for efficiency around 65w adapters are the highest that don’t need it, which is why 65w adapters are super common).

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I measured my 60W adapter at full load and can confirm that there is no PFC.

Measurements taken at 230V (power adapter still cold)


Watts

Amps