Cannot go wrong here. Ran the ATC 40 actives for some years with great results. They are world class speakers in either version and without being able to A/B them (passive vs active), I'm sure the actives would be more dynamic and immediate with attack. That being said, my wife runs ATC 20 passives set on Sound Anchor stands with a monster Luxman 509X integrated and they are also scary good.
If you do go with the passives, heed the advice given regarding really good amplification and upstream source/cabling as these transducers will glaringly reveal all that you've done correctly AND incorrectly.