Hi,
I'd use what ever more closely matched the original in every detail.
I went with a cheap aftermarket and the tranny connectors were cocked on a slight angle such that the only way I could align the male-female was to cut the lines, connect to the radiator and then splice with hose and clamps. Royal PITA.
To boot, there was a coolant port for some other application that needed to be capped and clamped. I just caught the cheap cap before it slipped off a week or two after instalation...had to go to a local radiator shop and he happened to have an old dirty heavy duty cap that applied perfectly. Could have lost the engine if that thing blew.
Spend the money. avoid the headache.
Tom