Most will say the separates i.e. passive set up. But the advantage of the active system is you get a tuned amp-speaker combo that's been optimized for the drivers and cabinet combo. If done right that can out perform passive set ups. you just loose the ability to tune your sound via amps and speaker wires. As for someone's comment that the amps in the LS60's wont be a resolving as an out board amp is not really true in my experience, testing equal quality speakers/amps and active speakers.
I have some very good active speakers in my office that do things my main system can't dream of at a fraction of the cost. If done right, I'm assuming kef did this right, you may be surprised how good actives can be.
