Unweighted PPG has to be to be the fairest because it’s the most straight forward process to decide the standings. It’s based on what HAS happened. When the season curtailed WWFC had the third highest points per game, fact.
Weighted PPG introduces a single variable (when hundreds are available) and it makes absolutely no sense to do this. If you’re going to weight home/away then you have to look at who’s played who and you could boil it down to the finest details, injuries etc. It opens a real can of worms and is completely impractical.
to be fair that is why the EFL have done it that way (I don’t agree with it) but they have taken view that PPG is based on what he actually happened where as WPPG is an element of predicting future. As I say I don’t agree but it is why EFL have gone that way.