I love Seymour Duncans, I have passive seymours 4 of my guitars and active (Blackouts) in one of them. Also EMG actives in another. It's all a matter of flavour and taste really... and how you play.
Personally I have found for metal you can have more a powerful rhythm sound with passive pickups as they effectively have more "bounce" ie dynamic range. If your right hand is doing the right thing then I think you can get more expression from passive pickups. Just my experience...
For lead I think it's a matter of taste again.
But anyhow, maybe this means your original pickups are fine? Unless there is a reason you need to change them, I kind of agree with Lutz and the other fellow that they are probably good to stay.
If you are dissatisfied with your tone, I would look at your amp before changing pickups!
Cheers and good luck,
Owen Gillett
