It does depend on, who's involved. Orange-Nassau(-Dietz) might be interested to get Lingen and Moers/Meurs back and the king in Prussia & prince-elector of Brandenburg renounces his claim of the title prince of Orange in favour of Orange-Nassau; they had disputed this inheritance with the Brandenburg-Prussian Hohenzollerns ever since Frederick-Henry and William III had left conflicting last wills.
Cleves, Mark, Ravenstein and Ravensberg are indeed attractive for the Palatinate. Prussian Gelderland could be returned to the Southern Netherlands.
I agree Minden, Tecklenburg and Halberstadt seem desirable for Hanover.
There are some (other) possibilities in a bit more to the east too. For instance Austria could get Lusatia and Crossen, but the elector of Saxony is compensated with Brandenburg-Prussian territory like the duchy of Magdeburg.
In any case Prussia-Brandenburg will keep Brandenburg proper, the kingdom of Prussia and probably Pomerania.
Vague recollection: There was one advisor to the Saxon court who was big on "natural shapes" for countries, so he advocated accepting that Brandenburg with Silesia was Oder-and-Spree-based, so had a "right" to the Lusatias. Saxony, OTOH, should be Elbe-and-Saale-based, which meant getting Magdeburg-Halle, Erfurt (from Mayence) and the suzerainty over den Ernestine Saxon Sukes in Thuringia. (And, in the long run, Saxony should somehow acquire Bohemia; but not Moravia, which is Danube-oriented).
Generally spoken:
In his various Political Wills, Frederick II. always describes Brandenburg, Pomerania, Silesia, Magedeburg and Halberstadt as the relevant heartland of his domains.
The western provinces are too far off and too small to defend them militarily, even having fortresses is inopportune, as in case of a war keeping themagainst sieges is too difficult and when you lose them, the enemy (like France) can keep them occupied.
East Prussia can realistically only be attacked by Russia, and Prussia can do nothing to defend it. Even evacuating the troops in East Prussia is difficult since the Vistula must be crossed. If the Russians occupy Danzig by sea, that is impossible unless a lot of soldiers are sent from Pomerania to cover the crossing.
Conferring these thoughts to a situation when Prussian has suffered a big defeat: Ceding any of the heartland provinces (not counting Silesia, of course, and formerly Silesian Crossen) might be hardest for F2, and he might look for any way before giving in.
Ceding Prussia proper is politically difficult since it means losing the right to a royal title. And, what is more, Russia might be actively opposed to Austria or even Poland acquiring East Prussia.
Ceding some or all of the western provinces might be the easiest sacrifice for a beaten Prussia besides formally giving up all claims on the Silesian principalities of Liegnitz, Wohlau and Brieg.