I'm a big advocate in using the right charger for the right device.
It might be more convenient to pack one charger and a bunch of cables for trips, but for long-term usage you're better off using a charger designed for your device because that's delivering the right amount of power for the battery. Regularly using a charger that delivers too much or too little power will affect the longevity of the battery.
If you are going to go down the third-party charger road, then make sure they are a reputable brand. No-name junk might look and feel like an original charger, but based on my testing I've found that what comes out of the cable can vary wildly.
Does it really make sense to hook up a $500 tablet to a $2 charger? I think not. While battery protection circuits do a good job of shutting off power that could damage a battery, poor quality chargers can still damage devices and the batteries inside them.