Both system types have their pros and cons. We're 100% passive FOH. When we bought our system the active cabs at the time were buggy and there were multitudes of complaints about them. This seems to have been fixed.
That's not to say we'll be replacing our rig anytime soon. I have yet to see any active rig do what our passive system can do.
For some generalized info,
Active systems tend to be less expensive, watt-for-watt than passives.
Active cabinets need two wiring sources ~ signal and AC power supplies. You may be running AC extension cords to your actives.
Active boxes contain onboard processing as well as power amps. They tend to be heavier than their passive brothers. Processing is tailor-made for the cabinets and good tone is easier to achieve.
Active systems can pick up ground loop noise if plugged into different AC services that that of the mixer feed. It's rare but still a possibility, especially in older venues or houses with crap electrical service.
Active cabinets offer little to no amp headroom whatsoever. It is what it is. If it ain't enough, you're SOL.
Passive systems generally involve more things to move because you'll need power amps to drive them.
Getting a good tone from passives involves a bit of tinkering with your processing. It can be done but it does involve dedication on the part of the operator.
Passive boxes need only the cable feed from the amp(s).
Passive systems are generally not limited by amp headroom. Just be careful not to overdo it.
Passive boxes are lighter in weight than their active bretheren.
Hope this helps.
