I would also choose the F1 from GT3, the older F1's are IMO much more interesting than the all-are-the-same-19000rpm F1's. Back in the early to late 80's formula one cars had turbo engines with well over 1200 HP in qualification, and looked in my opinion a lot better and different than todays F1.
You cant beat the sound of a V8 in 10000rpm with twin turbos installed.
GT features a lot of cars of the same race classification (LMGTP, Group-C.....etc), so why not include a bunch of F1's too?
PD always says they want to include as much historcally important cars as possible, if so they shouldnt miss open wheelers: The Brabham BT46 ''Fan Car'', the 79' Ligier JS11 etc.