Hi mrscarey... welcome to GT :)

It's going to be a personal preference thing. I'm not a fan of EMG pickups, but loads of the other members are. EMGs are suited to hi-gain situations... Zakk Wylde being a famous user. You'll find the Duncans more versatile, and with a good dirty channel on your amp, or a distortion / overdrive pedal you can get a decent metal tone with them as well.

The best advice I can offer is to try out guitars already loaded with the pickups you're considering, and see what you think. Me? I'd go DiMarzio...