I have 2 single room humidifiers, ReliOn (walmart) wick filter type and Vick warm air type.
The wick filter type is noisier over time as the fan wear out, it doesn't evaporate so much water that it causes the room to be too humid, and if you fill it correctly it didn't leak (at least my 6 year old one didn't), but I always under fill it so in the morning the filter will be completely dry, to avoid mold growing on the filter. I've only thrown away the original filter and get one replacement filter ($8 a few years ago) because the paper collapsed. The new filter has a metal frame inside to hold it up. You do have to soak it in vinegar or something to de-mineralize it if you use tap water.
The warm air one works without filter, is not really that quiet (you can hear the water boiling inside), and generate a lot more moisture than the wick filter one. It condense inside a small chamber inside and you have to be careful not to spill it when you refill or drain it out. If you use tap water, the heater will have calcium build up that you have to scrap out or soak in vinegar about once a week or so. There is no mold build up, but you have to turn it low as it can add too much moisture to the air.
The point is, all humidifiers have mineral buildups if you do not use distill water, either in the filter or in the evap chamber.
Then there's always the rice cooker if you don't want to buy something that you rarely use, which works great.