Having never been to Brazil and need to fly there from the US and then connect ot a domestic flight, I'd figured I'd ask the experts :-)

My routing choices are:
DEN-IAH-GIG-FOR
DEN-IAH-GRU-FOR
DEN-ORD-GRU-FOR
DEN-EWR-GRU-FOR

Assume same price, similar connection times, etc. Flights to be taken mid-Feb.

Thanks!