Dextrose pwo IMHO.
Hint: take the full amount you were to add to this ONE meal, and split that amount up amongst BOTH of your PWO meals. This will further assure you that you don't take in too many carbs at once to spill-over, but you still ingest a good deal more during that "window" you have to get those nutrients in.
This means you'll be having more dextrose pwo, then more of the solid starch in the 2nd post-workout meal.
Damn, there's another secret gone!
Remember that R-ALA and Biotin here as well, with both meals!
~SC~