They can be hard to figure out. It looks to me like the bottom hose is wet, so that would be my guess.
x2..
try cutting a half inch off the wet hose and see if that fixes your leak..
ive found that those braided return lines dont always seal the best.. i use toyota vacuum line for my return lines from the injectors.. they fit ALOT better than the braided hose. they dont want to come off sometimes, because they fit SOO GOOD..
anyways, its hard to determine if your leak is from either location.. it could even be from the high pressure line..
my rabbit had a leak in the exact same spot, and would only get the pump side of the injector wet.. anyways, i replaced my return lines more than a few times, tightened the injector halves, tightened my high pressure line, did everything in my power.. never fixed that leak..
anyways, fast forward to engine swap time, and i had the injection pump off the engine, and i found, believe it or not, that my injection pump was missing a screw from the cold start mechanism.. fuel would only spray from the pump when internal pressure was highest.. i never revved the engine up to look for leaks.. so i never saw that MY PUMP was actually the source of the leak!