I use PFPX weather for the flight plan and use ASN for weather for the flight. I believe the PFPX winds in the flight plan are forecasts. ASN winds are a snapshot at the time the flight plan is computed. If you fly long distance using normal time you need PFPX winds. If you use time acceleration, ASN might be better. I just finished a 14 and 1/2 flight  and the T7 arrived at the destination about 8 minutes later than PFPX had predicted. If you use time acceleration you don't need winds that are forecasted 8-14 hours out from the time of departure. Your flight would be over before you needed the forecasting ability of PFPX. At any given time both PFPX and ASN winds are close as evidenced by the flight I mentioned above. A difference of 8 minutes over 7000+ miles.

 

Sorry for the massive thread bump. But I found it interesting what you said. PFPX weather will input forecasted winds aloft for your flightplan and ASN will input snapshot of the current winds aloft into your flightplan. Is this still the case some 1+ year later? I have always been using ASN for the weather inside PFPX.

I think you should bump this to the PFPX forum.

Is this still the case some 1+ year later?

For me it is. I am still using ASN SP2. I have installed ASN SP4 several times but for my system it is a frame rate killer for both the T7 and the NGX. So I stay with SP2. I have not read any documentation or their manual on SP4 so I don't know if the winds are still snapshots or forecasted. If I was a betting man, I would wager money on snapshots for ASN SP4.